Michael Freno 8768f9de97 fix: sub-agent hang/crash stranding runs mid-phase with no save ...

A stalled sub-agent (provider stream never settling after the final tool
call, or a throwing session-event listener recursing through the SDK's
run-failure path to stack overflow) left the phase stuck in_progress with
no state save, no error, and no completion message — observed twice in
freno-dev, both times after comments wrote findings.md.

- agent-runner: 60-min settle watchdog on every agent phase
  (PYGIENIUM_AGENT_TIMEOUT_MS, env-tunable); timeout disposes the session
  and fails the phase loudly with a /pygienium-resume hint instead of
  hanging the check-runner's await forever.
- agent-runner: applySessionEvent — the session.subscribe listener can no
  longer throw into the SDK event pipeline (guards for partial/malformed
  events, optional-chained message_update, throwing chat forwarder).
- comments: scan no longer regenerates the full report as its final
  message (findings.md is the source of truth); fix phase reads
  findings.md with embedded fallback.
- check-runner: failing state-save inside the catch path can't double-
  fault or escape as an unhandled rejection; completion posting is
  best-effort.
- tests: watchdog timeout test, comments task-text regression tests,
  applySessionEvent malformed-shape unit tests. 146 pass, tsc clean.
- README: document PYGIENIUM_AGENT_TIMEOUT_MS.

2026-08-11 08:47:12 -04:00

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