Warn about missing pre-commit hooks during session workflows

[minev-dev]

• Check configured hooks before session creation and after successful auto-commit.
• Show actionable prek install and pre-commit install commands while allowing sessions to continue.
• Record deduplicated commit warnings and add unit, E2E, and documentation coverage.

Co-Authored-By: Agentty

[greptile-apps]

Greptile Summary

This PR changes the pre-commit hook enforcement model from a hard commit gate to a soft advisory: a missing hook no longer aborts auto-commit, but instead triggers a [Commit Warning] in the session transcript and an overlay when the user opens the session-creation flow with a.

• Behavioral shift in sync.rs: ensure_pre_commit_hook_ready is removed from commit_all_with_retry, so commits now succeed regardless of hook installation; the new check_pre_commit_hook_ready helper is exposed for advisory-only calls.
• Session-creation warning (list.rs, key_handler.rs, overlay.rs, app_mode.rs): Pressing a now runs an async hook check via open_session_creation_flow; a missing hook transitions to PreCommitHookWarning mode with Enter/Esc/q navigation before reaching the selector.
• Post-commit advisory (task.rs): After each successful auto-commit, append_pre_commit_hook_warning checks hook readiness and persists one [Commit Warning] per distinct missing-hook message, using a linear transcript scan for deduplication.

Confidence Score: 5/5

Safe to merge. The change is advisory-only and removes no commit-blocking behavior that existing callers depended on in a correctness-critical way.

All new code paths are exercised by unit tests (including the deduplication invariant checked at both in-memory and database levels) and a reworked E2E test. No error path is silently swallowed — unexpected check_pre_commit_hook_ready errors fall through to warn! logging.

No files require special attention.

_{Reviews (5): Last reviewed commit: "Warn about missing pre-commit hooks duri..." | Re-trigger Greptile}

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud