Description

When a terminal is opened for the first time, the shell briefly starts in / before cd-ing to the target working directory. The per-frame CWD tracking loop (runtime.zig:1397–1407) picks up this transient / and calls persistence.appendRecentFolder("/"), permanently inserting it into the recent_folders list. Because this happens on every new terminal spawn, / accumulates a high visit count and floats to the top of the Cmd+O overlay. Users who never intentionally navigate to / find it dominating the list. Additionally, existing persistence.toml files already contain this spurious entry, so a one-time migration that removes / from saved recent_folders data is needed.

Steps to Reproduce

Starting state: Fresh install or cleared ~/.config/architect/persistence.toml; recent_folders is empty.

1. Open Architect.
2. Open a new terminal (the shell spawns, briefly cwd is /, then cd's to the target dir).
3. Open the Cmd+O recent-folders overlay.

Reproducibility: Always

Expected Behavior

/ does not appear in recent_folders unless the user explicitly navigates to it (e.g., cd /).

Actual Behavior

/ appears at or near the top of the recent-folders list after opening any terminal.

Suspected Area

• src/app/runtime.zig — per-frame CWD update loop (updateCwd + appendRecentFolder call, lines 1397–1407): the initial transient / cwd must be suppressed.
• src/config.zig — appendRecentFolder (lines 471–498) and migration logic (lines 311–394): a V4 migration pass should strip / from existing recent_folders data.

Acceptance Criteria

• Opening a new terminal no longer adds / to recent_folders (unless the user subsequently navigates there manually).
• A persistence migration (V4) removes any existing / entry from recent_folders on the first load after upgrading.
• Manually running cd / in a terminal does still add/bump / in recent_folders.
• The fix does not break existing tests; regression test added if feasible.
• docs/configuration.md migration notes updated to reflect the new V4 format.