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* feat(daemon): force-stop hung agent runs via idle watchdog (MUL-2281) A backend whose subprocess hangs on a stuck child process (e.g. claude blocked on `docker ps` against a frozen dockerd) keeps the daemon's run record at status="running" until the full DefaultAgentTimeout (2 h) expires, because cmd.Wait() never returns and Session.Result is never written. MUL-2225 spent 17+ minutes in this state in the wild. Add a per-task idle watchdog around executeAndDrain: - Wrap the caller's ctx so a single cancel propagates to the agent subprocess (via the ctx passed to backend.Execute) AND the drain loop. - Stamp lastActivityAt every time the drain loop receives a message. - Tick at window/2; when idle_for >= window AND session.Messages buffer is empty, set a fired flag and call cancel. - Tag the resulting Result.Status as "idle_watchdog" so runTask routes it through a dedicated failure_reason instead of "agent_error". Default window is 5 min, configurable via MULTICA_AGENT_IDLE_WATCHDOG; set to 0 to disable. Tests cover the activity-then-silence case, the zero-message case, the disabled case, and the happy path. Co-authored-by: multica-agent <github@multica.ai> * fix(daemon): skip idle watchdog while a tool call is in flight A legitimate long-running tool call (npm install, docker build, test suite) can sit silent between tool_use and tool_result for many minutes. Without this gate, the watchdog would yank the agent mid-build. Track unmatched tool_use messages in an atomic counter; only let the watchdog fire when the counter is zero. tool_result clamps non-negative so a stray result with no matching use can't re-arm the watchdog one call too early. Adds two regression tests: - DoesNotFireDuringInFlightToolCall: tool_use -> silence past window -> tool_result -> completed (must NOT fire) - FiresAfterToolResultIfBackendStaysSilent: tool_use -> tool_result -> silence past window (MUST fire — backend really is stuck) Co-authored-by: multica-agent <github@multica.ai> --------- Co-authored-by: multica-agent <github@multica.ai>