docs: update AI agent guidelines (Human label, find-and-open args, PR/issue templates)

[fabien-marty]

No description provided.

[fabien-marty]

@claude revert changes to python files (already commited in another PR)

[claude]

Claude finished @fabien-marty's task in 2m 33s —— View job

---

Reverting Python file changes

• Gather context
• Revert atomic_lru/_cache.py to origin/main (already matched — no change needed)
• Revert atomic_lru/_storage/storage.py to origin/main (restored 4 validation lines that were removed)
• Commit and push changes

The Python files have been reverted. _cache.py already matched origin/main. _storage/storage.py had 4 validation lines removed that have now been restored:

• max_items must be at least 1 check
• default_ttl cannot be negative check
• expiration_thread_delay must be positive check
  | Branch