feat: emit a structured JSONL audit log for tool calls - #2473
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Write an append-only JSONL activity log - one self-contained event per line - next to the binary (overridable with OPENAGENT_AUDIT_DIR), so an external tool can tail OpenAgent's tool activity read-only, without touching the database. - One audit event per tool call, covering every exit path of callMcpTool: a malformed-argument call and a call to an unregistered builtin/MCP tool are recorded too (outcome "not_found"), since those are exactly the calls an audit log must not miss. A deferred Record guarantees a single event regardless of how the call returns. - One file per session: the chat/session id is threaded through ToolSession into every event, so sessions never interleave. The admin one-shot tool path has no session and uses a shared fallback file. - Writes are non-blocking: events are handed to a background writer, so a slow or stalled audit directory (e.g. a network mount) can never slow or fail the tool call it records. Events are dropped rather than allowed to block if the writer falls behind.
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Summary
Adds an append-only JSONL audit log for tool calls, so an external tool can tail OpenAgent's tool activity read-only, without touching the database. Today the only record of a tool call lives in SQLite and in free-form stdout logs; neither is safe or practical for an external auditor to consume.