Features:
- #353 Add exact match support for stop-words
- #341 Add approved-only reporting and auto-ban threshold
- #349 feat: validate bot username in /report@botname commands
Bug Fixes:
- #351 fix: prevent message edits from triggering duplicate spam detection
- #346 fix: delete orphaned /report commands to keep chat clean
- #338 Fix OpenAI short message check to ignore veto mode
Maintenance: