- Delete CodeSession::chat() — the legacy inline tool loop that
duplicated the orchestrator's conversation + tool dispatch logic
- Delete wait_for_tool_result() — only used by the legacy path
- Make orchestrator mandatory in run_session (no more if/else fallback)
- Unify conversation creation into create_fresh_conversation()
- Add corrupted conversation recovery to create_or_append_conversation:
detects "function calls and responses" errors from Mistral (caused by
disconnecting mid-tool-call) and auto-creates a fresh conversation
- Add tracing-appender for optional rotating log file (SOL_LOG_FILE env)
- Add Procfile.dev for overmind process management
