Part of #489.

Summary

When running inside a git worktree whose main repo also has AGENTS.md, don't load the same file twice.

Reference

reference-cc/src/utils/claudemd.ts:868-884.

Acceptance

• Worktree under a parent repo loads each file exactly once.
• No-op when not inside a worktree.

Effort: S (~80 LoC).