Replace bluesky_reply with atomic add_post_to_bluesky_reply_thread tool
- Remove bluesky_reply tool to eliminate confusion with threading approach
- Add new add_post_to_bluesky_reply_thread tool for building reply threads atomically
- Each call adds a single post to the reply thread queue
- Handler (bsky.py) manages actual thread state and AT Protocol threading
- Better error recovery: individual post failures don't affect entire thread
- Added TOOL_CHANGELOG.md to document changes for agent migration
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Co-Authored-By: Claude <noreply@anthropic.com>