Add ATProto records for tool calls and reasoning traces
- Added create_tool_call_record() to publish stream.thought.tool_call records
- Added create_reasoning_record() to publish stream.thought.reasoning records
- Updated process_mention() to create records for both reasoning and tool calls
- Updated send_synthesis_message() to create records during synthesis
- Records include timestamp and preserve raw tool arguments as strings
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Co-Authored-By: Claude <noreply@anthropic.com>