fix: resolve 6 high-severity bugs

[robotlearning123]

Summary

Fixes 6 high-severity bugs identified during code review:

• Silent hook failures - Hook errors now tracked in metadata; critical hooks (priority < 10) stop execution on failure
• RPC memory leak - Added createdAt timestamp and cleanupStaleRequests() to prevent unbounded pendingRequests growth
• Silent JSON parse errors - Now logs parse errors with content preview for debugging
• Silent skill command errors - Captures full error details including stderr and exit codes
• Background task memory leak - Auto-cleanup of tasks older than 1 hour, capped at 100 tasks
• Unsafe command execution - Added security documentation for skill command execution

Test plan

• TypeScript compilation passes
• ESLint passes
• All 116 tests pass
• Manual verification of error logging in hooks
• Manual verification of RPC cleanup under load

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