code-review-graph install overwrites existing hooks for Claude

[dmonizer]

code-review-graph install overwrites existing hooks in .claude/settings.json, without even creating a backup file.

VERY annoying.

[tirth8205]

Fixed in PR #145 — the install command now backs up settings.json and merges new hooks with existing entries instead of overwriting. Please update to the latest version.

[tirth8205]

The merge logic issue (overwriting existing hooks) was fixed in one respect — settings_path.read_text is now called and existing config is loaded — but skills.py line 389 still does existing.update(hooks_config) which replaces the entire 'hooks' key rather than merging individual hook entries. PR #203 addresses this properly with per-event merge logic. Reopening.