fix: agent mention detection, Anthropic tool-calls, MCP session stability, CLI logging

[phreakocious]

Summary

• Agent mention detection: Adds _is_mentioned() to CollaboratorAgent so agents respond to @agent_id mentions even without an explicit trigger, not just react_to_all_messages mode
• Anthropic tool-call format: Converts OpenAI-style tool_calls/tool messages to Anthropic's tool_use/tool_result content blocks in AnthropicProvider, fixing broken tool use flows
• MCP session stability: Uses AsyncExitStack to properly manage stdio transport and session context managers, preventing premature cleanup of background tasks. Also fixes input_schema parameter name for tool registration
• CLI logging: Adds missing imports (yaml, rich.progress, configure_workspace_logging) needed by the CLI agent module
• Misc: Removes duplicate comment, fixes from ast import Dict → from typing import Dict

Test plan

• Verify agents respond to @mention in workspace threads
• Confirm Anthropic-backed agents can execute tool calls end-to-end
• Test MCP stdio server connections remain stable over extended sessions
• Run CLI agent commands and confirm no import errors

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