feat: register additional CC hook types (FileChanged, CwdChanged, PreCompact, PostCompact)

[OneStepAt4time]

Context

Aegis currently registers 14 CC hook types in hook-settings.ts. Claude Code supports additional hooks that could provide valuable telemetry:

Proposed Additions

Hook	Value for Aegis
FileChanged	High — Track which files an agent is modifying in real-time without JSONL parsing. Useful for monitoring, conflict detection, and progress reporting.
CwdChanged	Medium — Know when agent changes directory. Useful for context tracking.
PreCompact / PostCompact	Low-Medium — Know when CC compacts context. Useful for detecting sessions approaching context limits.

Why

• FileChanged enables real-time file tracking in the dashboard and Telegram updates ("Agent is editing server.ts")
• Knowing when compaction happens helps detect sessions that are running long and may lose context
• More telemetry = better stall detection ([Bug][P2] Session shows 'working' but CC is stalled in 'Misting' state for 1h+ #562)

Implementation

1. Add events to HTTP_HOOK_EVENTS in src/hook-settings.ts
2. Add handlers in src/hook.ts (forward to monitor/Telegram)
3. Verify these hook types are valid across CC versions (check against CC 2.1.63+ to avoid [Bug][P1] Invalid hook type 'StopFailure' causes Claude Code settings error on session creation #555 regression)
4. Add tests

Compatibility Note

After #555, we must verify each new hook type is recognized by the minimum supported CC version before adding it. Consider a CC version check (#564) or feature flags.

[OneStepAt4time]

🔧 Starting work on this. ETA: ~20 min per issue. Separate PRs targeting v2.7.0.