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docs+CLAUDE.md: PIR for 01:23Z file-state revert + mtime-checkpoint extension
Per supervisor 02:35:05Z (PIR redirect to theologian) + 02:37:20Z (GO atomic commit + Tier 8 Phase A resume directive). Theologian 02:36:49Z PIR delivery + 4-section CLAUDE.md amendment. PIR scope (docs/2026-04-24-pre-edit-revert-pir.md, 132L NEW): (1) Automated-detection feasibility — 3 options analyzed: (a) inotify file-watcher daemon: feasible but multi-session NBS-suite extension; DEFERRED to W48 (b) pre-commit git hook: REJECTED (duplicates gate python#3) (c) agent-side mtime-checkpoint discipline: ADOPTED (~5L per agent edit-loop; in-session feasible) (2) Per-incident root-cause attribution for 5 priors + this incident: D-1775810621 / D-1775669703 / D-1776414469 — SYMPTOM-only D-1776434533 — DIRECTIVE-only (Alex 'always full commit checkouts') D-1776887480/D-1776890644 — GATE-hardening (gate python#3 added) 2026-04-24T01:23Z — SYMPTOM-only (observed-but-not-attributed) TOTAL: 6 incidents, 0 root-cause attributions (3) Class CONFIRMED 'undiagnosed-recurring' (already labeled in CLAUDE.md amendment e8a83df per pythia python#105) CLAUDE.md mtime-checkpoint extension (+1L net, rule 1 enhancement): Pre-edit baseline now also captures per-touched-file mtime via `stat -c %Y %n`; verify before each subsequent write within edit sequence. mtime mismatch = external revert; HALT. Mechanizes detection vs requiring agent to notice mid-edit. Bundle scope: doc-only (PIR file + CLAUDE.md edit), no §3.5 BUILD MODE per touched-files rule. Atomic per supervisor 02:37:20Z. Phase 3 closure-amendment (docs/tier7-phase3-closure-summary.md) remains STAGED on disk per theologian 02:36:49Z + supervisor 02:37:20Z ('RETRACT only on successful Phase A resume push'). NOT committed this commit. Tier 8 Phase A resume armed post-push 29 per supervisor 02:37:20Z GO (R-retry) — PIR + mtime-checkpoint discipline mechanizes recurrence detection; don't infinitely block on Alex when discipline armed.
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‎CLAUDE.md‎

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Multi-file edit sequences (≥2 files) require working-tree integrity discipline:
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1. **Pre-edit baseline snapshot.** Before multi-file edit, capture `git status --short` + `git diff --name-only HEAD`. Confirm tree state is clean OR known-modified.
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1. **Pre-edit baseline snapshot.** Before multi-file edit, capture `git status --short` + `git diff --name-only HEAD`. Confirm tree state is clean OR known-modified. **Per 2026-04-24 PIR option (c):** also capture per-touched-file mtime via `stat -c "%Y %n"` baseline; verify before each subsequent write within the edit sequence (mtime mismatch on a file you didn't write = external revert; HALT).
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2. **Mid-edit integrity check.** If any touched file's mtime/content changes UNEXPECTEDLY during edit (not as result of agent's own write), HALT immediately. Restore to baseline via `git checkout HEAD -- <file>` per Alex directive D-1776434533.
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‎docs/2026-04-24-pre-edit-revert-pir.md‎

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# Pre-Edit External-Revert Post-Incident Review (PIR)
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**Date:** 2026-04-24
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**Incident:** Tier 8 pilot Phase A execution HALT (01:23Z, generalist
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01:24:43Z observed-but-not-attributed)
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**Owner:** theologian (per supervisor 2026-04-24T02:35:05Z redirect
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from fixup; fixup-6bbfee5a session ended 02:14:01Z pre-assignment per
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librarian 02:34:46Z)
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**Triggered by:** pythia #105 (1)+(3) 2026-04-24T02:12:18Z + supervisor
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02:14:16Z scope assignment + pythia #104 (3) 2026-04-24T01:36:43Z
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---
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## 1. Incident class: undiagnosed-recurring file-state-revert
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Six incidents on file (this PIR's 2026-04-24 incident + 5 priors per
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librarian 2026-04-24T01:46:19Z institutional memory):
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| Incident | Decision-log ID | Resolution class | Root cause attribution |
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|---|---|---|---|
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| Dirty tree partial revert → 48 vs 40 byte Instr layout mismatch | D-1775810621 | SYMPTOM-only | NONE — no actor identified |
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| Uncommitted builder.h decl → ARM64 build failure, gate BLOCKED | D-1775669703 | SYMPTOM-only | NONE — no actor identified |
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| Uncommitted hir.h edit → false BUILD PASS | D-1776414469 | SYMPTOM-only | NONE — no actor identified |
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| Alex directive: always full commit checkouts, no partial reverts | D-1776434533 | DIRECTIVE-only | NONE — no diagnosis of cause |
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| Gate item #3 hardened: HEAD==binary AND tree-clean during build | D-1776887480 / D-1776890644 | GATE-hardening | NONE — no diagnosis of cause |
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| 2026-04-24T01:23Z external file-state revert during Tier 8 Phase A | (this incident) | SYMPTOM-only | NONE — generalist 01:24:43Z observed-but-not-attributed |
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**Conclusion:** 6 incidents, 0 root cause attributions on file. Class
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labeled UNDIAGNOSED-RECURRING per pythia #105 (3) + CLAUDE.md
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amendment 03a0dcb569 (theologian 2026-04-24T02:14:46Z).
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---
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## 2. Automated-detection feasibility analysis
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### 2.1 Option (a) inotify file-watcher daemon
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- **Feasibility:** YES, technically feasible (Linux inotify or
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fanotify; ~100-200L Python/C daemon process)
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- **Coverage:** mid-edit divergence (writes invalidate snapshot)
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- **Cost:** separate process management; agent integration (agents
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don't currently spawn watchdogs)
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- **Blast radius:** NBS-suite extension required for agent
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integration; multi-session workstream
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- **Disposition:** DEFERRED to W48 future workstream; not required
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for immediate Tier 8 Phase A resume
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### 2.2 Option (b) pre-commit git hook
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- **Feasibility:** YES (standard git infra)
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- **Coverage:** commit-time only (no mid-edit detection)
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- **Cost:** ~10-20L bash hook + integration into push.sh / commit
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workflow
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- **Power vs gate #3:** SAME coverage class — gate #3 already
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enforces HEAD==binary AND tree-clean during build. Pre-commit
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hook would duplicate; no detection improvement
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- **Disposition:** REJECTED — duplicates existing gate #3 without
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net new detection power
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### 2.3 Option (c) agent-side mtime-checkpoint discipline
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- **Feasibility:** YES, agent-side discipline (no infra)
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- **Coverage:** mid-edit divergence (per-edit mtime baseline +
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verify-before-next-write)
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- **Cost:** ~5L per agent edit-loop in CLAUDE.md discipline
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- **Power:** detects revert between writes via mtime mismatch;
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HALT before further damage
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- **Disposition:** RECOMMEND ADOPT as Pre-Edit WT Integrity rule 1
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extension. Lightweight, in-session feasible
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### 2.4 Recommendation
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ADOPT (c) agent-side mtime-checkpoint discipline as immediate
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extension to CLAUDE.md Pre-Edit WT Integrity rule 1. File W48
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NBS-suite tree-watcher extension as future workstream (deferred;
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not required for Tier 8 Phase A resume).
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---
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## 3. Honest framing per pythia #105
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This PIR confirms: 6 incidents, 0 root causes attributed. Discipline
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escalation pattern: directive (D-1776434533) → gate #3 hardening
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(D-1776887480) → 4-step discipline (03a0dcb569 today) → mtime-
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checkpoint extension (proposed).
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Each escalation describes the recurrence; none diagnose it.
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Per pythia #105 'fever-has-name-infection-spreads' framing: discipline
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is reactive containment, not root-cause cure. CLAUDE.md amendment
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03a0dcb569 honest framing paragraph correctly states this limit.
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Going forward: if 7th incident occurs after mtime-checkpoint adoption,
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ESCALATE to W48 NBS-suite tree-watcher feasibility study (option (a)).
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---
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## 4. Tier 8 Phase A resume recommendation
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PIR result UNBLOCKS Tier 8 Phase A resume per supervisor 2026-04-24
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T02:14:16Z 'PIR result needed before next supervisor checkpoint':
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1. PIR delivered (this doc) with feasibility analysis +
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undiagnosed-recurring acknowledgment
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2. RECOMMEND atomic commit: docs/2026-04-24-pre-edit-revert-pir.md
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+ CLAUDE.md mtime-checkpoint extension to rule 1 (1-2L addition)
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3. Push 29 lands PIR + discipline extension
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4. Tier 8 Phase A resumes per (R-retry) under enhanced discipline
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5. If Alex 01:25:09Z disposition lands later confirming intentional
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revert, theologian re-evaluates; meantime PIR satisfies pythia
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#105 (3) requirement
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Phase 3 closure-amendment fast-path STAGED on disk per supervisor
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02:23:54Z + theologian 02:26:02Z. Triggers ONLY if PIR rejected OR
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Alex disposition negates Phase A resume; otherwise RETRACT amendment
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on Tier 8 Phase A successful resume.
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---
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## 5. Cross-link
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- Pythia #104 (3) 2026-04-24T01:36:43Z (recurrence-prevention plan
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request)
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- Pythia #105 (1)+(3) 2026-04-24T02:12:18Z (automated-detection
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feasibility + undiagnosed-recurring class label)
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- Supervisor 2026-04-24T02:14:16Z scope assignment to fixup
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- Supervisor 2026-04-24T02:35:05Z redirect to theologian
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- Librarian 2026-04-24T01:46:19Z institutional memory (5+ priors)
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- Librarian 2026-04-24T02:34:46Z fixup operational gap note
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- CLAUDE.md amendment 03a0dcb569 (theologian 2026-04-24T02:14:46Z)
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- Phase 3 closure summary fa8dfef1e1 (generalist 2026-04-24T01:05:45Z;
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closure-amendment STAGED on disk per theologian 2026-04-24T02:26:02Z)
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- Tier 8 spec docs/tier8-class-b-cport-migrate-arm-spec.md

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