Add PreCompact hook for conversation archiving, remove /clear command

- Add PreCompact hook in agent-runner that archives conversations before
  compaction, using session summary from sessions-index.json for filename
- Remove /clear command (programmatic compaction not supported by SDK)
- Add /add-clear to RFS for future implementation
- Update CLAUDE.md templates with memory system instructions

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

src/config.ts

@@ -17,4 +17,3 @@ export const CONTAINER_TIMEOUT = parseInt(process.env.CONTAINER_TIMEOUT || '3000
 export const IPC_POLL_INTERVAL = 1000; // Check IPC directories every second
 
 export const TRIGGER_PATTERN = new RegExp(`^@${ASSISTANT_NAME}\\b`, 'i');
-export const CLEAR_COMMAND = '/clear';