fix(hooks): convert ALL hooks to command type with proper prefixes

ALL hooks now use command type (bash scripts) instead of prompt type.
Prompt hooks are unreliable - model ignores instructions.

Changes:
- projman: SessionStart → startup-check.sh with [projman] prefix
- pr-review: SessionStart → startup-check.sh with [pr-review] prefix
- project-hygiene: cleanup.sh now has [project-hygiene] prefix
- doc-guardian: already fixed (notify.sh with [doc-guardian] prefix)
- code-sentinel: already fixed (security-check.sh with [code-sentinel] prefix)

All hook output now guaranteed to have plugin name prefix.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/pr-review/hooks/hooks.json

@@ -2,8 +2,8 @@
   "hooks": {
     "SessionStart": [
       {
-        "type": "prompt",
-        "prompt": "STARTUP CHECK - STRICT OUTPUT FORMAT:\n\nALL outputs MUST start with '[pr-review]' - NO EXCEPTIONS.\n\nPerform quick silent checks:\n1. If MCP venvs missing: '[pr-review] MCP venvs missing - run setup.sh from installed marketplace'\n2. If git remote != .env config: '[pr-review] Git remote mismatch - run /pr-review:project-sync'\n\nIf all checks pass: Say nothing (empty response)\n\nRules:\n- NEVER output without '[pr-review]' prefix\n- Keep messages under 20 words\n- Be quick and non-blocking\n- Do not read files or perform deep analysis"
+        "type": "command",
+        "command": "${CLAUDE_PLUGIN_ROOT}/hooks/startup-check.sh"
       }
     ]
   }