fix(zmux): handle workspace basename collisions - #1741

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>

## Problem

Two checkouts with the same folder name cannot both open managed zmux shells; failed panes also send input to missing terminals.

## Change

Reuse registered bindings and keep free basenames unchanged.
On `repository_conflict`, retry exactly once with twelve SHA-256 hex characters from the root's realpath appended to its basename; surface any retry failure.
Failed panes discard writes and become read-only, without new retry UI.

## Scope and approval

Closes #1727.
Host approved this bounded fix.

## Verification

- [x] **Tests:** 30 passed, 0 failed.
- [x] **Types:** server and web exit 0.
- [x] **Builds:** server and web exit 0.
- [x] **Lint:** no errors, 8 warnings.
- [x] **Fork CI:** exit 0.
- [ ] **UI:** host grounding and evidence.

Tests cover free names, realpath-based suffixes, existing bindings, bounded retry, non-conflict failures, and ignored failed-pane writes.
No server or browser was started; UI evidence awaits host grounding.

Model: gpt-6.1-sol; harness: Pi.

## Fork trailers

Squashes:

- 5911207e873 fix(zmux): handle workspace basename collisions (#1741) (#1741)
- 2d5eb8b231b fix(web): retarget hidden terminal splits when shown (#1763) (#1763)
- 55896883ab2 fix(web): terminal OSC 52 copies reach the client clipboard (#1790) (#1790)

Fork-Domain: zmux-estate
Fork-Tier: bugfix
Fork-Upstreamable: no
Co-authored-by: donjor <[email protected]>