fix: replace bash wrapper hooks with direct mempalace commands (Windows path fix)

[w1tc4]

Problem

On Windows, the Stop and PreCompact hooks fail with:

Stop hook error: /bin/bash: C:UsersRachael.claudepluginscachemempalacemempalace3.3.6/hooks/mempal-stop-hook.sh: No such file or directory

CLAUDE_PLUGIN_ROOT on Windows expands to a backslash path (C:\Users\...). When passed to bash, the backslashes are treated as escape sequences and stripped, producing a non-existent path.

Fix

The .sh wrappers are single-line pass-throughs to mempalace hook run. Replace the bash wrapper calls with the direct command, which works cross-platform since mempalace is on PATH after installation.

Before:

"command": "bash \"${CLAUDE_PLUGIN_ROOT}/hooks/mempal-stop-hook.sh\""

After:

"command": "mempalace hook run --hook stop --harness claude-code"

Same for PreCompact.

Testing

Verified on Windows 11 with Claude Code v2.1.157 — Stop and PreCompact hooks run cleanly after this change.

Closes #1660

[gemini-code-assist]

Code Review

This pull request updates the plugin hooks to use the mempalace hook run command, introduces a configurable persistence directory for ChromaDB by reading backend.persist_directory from mempalace.yaml, and updates the configuration saving logic in room_detector_local.py to preserve existing keys (like backend or storage) instead of overwriting them. There are no review comments, so I have no feedback to provide.

[igorls]

Two confirmed blockers, plus a routine rebase, before this can go in:

1. PreCompact hook command is broken (one-char fix). .claude-plugin/hooks/hooks.json:20 calls mempalace hook run --hook pre-compact …, but cli.py:1457 only accepts choices=["session-start","stop","precompact"] — no hyphen. Verified: mempalace hook run --hook pre-compact … exits 2 with invalid choice: 'pre-compact'. So this change doesn't fix PreCompact, it makes it fail on every platform. It must be --hook precompact (the Stop line, --hook stop, is already correct).

2. Out-of-scope, half-wired persist_directory feature. The PR is described as a hooks fix, but it also adds _resolve_persist_dir() and reroutes the writer to backend.persist_directory while many readers still hardcode os.path.join(palace_path, "chroma.sqlite3") (e.g. searcher.py:308, mcp_server.py:742, plus repair/migrate/palace). If anyone sets persist_directory, the DB is written in one place while search/status/repair look in another → split-brain palace + false "no palace". This is the same defect as fix(backend): respect backend.persist_directory from palace mempalace.yaml #1658. Please split it into its own PR, wired end-to-end + tested, or drop it here.

Also needs a rebase onto current develop (real conflict in chroma.py _prepare_palace_for_open). To be clear — I checked and merging this does not revert #1617 (that was a 2-dot-diff artifact from the stale base), so no regression there; it's just a normal rebase.

The hooks-only change, corrected to precompact and kept as a thin wrapper, is a ~1-line fix and very welcome.

[w1tc4]

• .claude-plugin/hooks/hooks.json only — 2 lines changed
• bash "..." → mempalace hook run --hook stop/precompact --harness claude-code
• pre-compact → precompact fixed
• No persist_dir code