emrg: GUI daemon heartbeat — periodic liveness probe + active reconnect (rant 2026-08-21T12:44:34)

[argszero]

Summary

Fixes rant 2026-08-21T12:44:34 (heartbeat item) — the GUI had no periodic liveness probe: daemon_client.js only sends one ping after connect ("不做轮询"), and the daemon connection's disconnected event was never listened to in main.js (the 2026-08-21 11:41 incident: GUI killed the daemon, never reconnected for 36 minutes, stale green status dot).

Changes

• emrg/gui/main.js
  • startHeartbeat() / stopHeartbeat() / _heartbeatTick(): every 15s, ping the daemon connection via waitForPong(3000, conn); on no-pong or a dropped connection → scheduleReconnect() (existing exponential backoff, already pushes connected:false/reconnecting status to the renderer so the status dot is truthful).
  • waitForPong(timeoutMs, connOverride) — optional connection override so the heartbeat probes the daemon connection specifically (not the active session connection).
  • Wiring: heartbeat started on ensureConnected() success; stopped when scheduleReconnect() is entered (no double-trigger) and on window-all-closed.
• emrg/gui/test/renderer.smoke.test.js — source-level test asserting the heartbeat wiring exists (constants, functions, waitForPong reuse, scheduleReconnect hook, start/stop wiring).
• Agent.md — GUI test breakdown synced (renderer smoke 127→128, total 256→257).

Verification

• GUI: npm test — 257 tests, 249 pass, 8 skipped (live daemon owns fixed port), 0 fail
• node --check main.js OK
• Python: uv run pytest tests/ — 987 passed + 1 skipped (incl. doc-count guards)
• python -m emrg --help + import OK

[argszero]

✅ LGTM — cycle

Fresh review of the GUI heartbeat fix (rant 2026-08-21T12:44:34):

• _heartbeatTick() every 15s probes the daemon connection: !conn.connected (dropped, no listener existed before) or no pong in 3s → stopHeartbeat() + scheduleReconnect() — reuses the existing exponential-backoff reconnect which already pushes connected:false/reconnecting to the renderer, so the status dot becomes truthful.
• waitForPong(timeoutMs, connOverride) — optional conn param so the heartbeat pings the daemon connection specifically rather than the active session connection (which would otherwise hide a dead daemon while a session is open).
• Wiring: startHeartbeat() on ensureConnected() success; stopHeartbeat() in scheduleReconnect() (prevents double-triggering) and window-all-closed. Heartbeat tick returns early when stopping.
• Test: source-level assertion of the heartbeat wiring (constants, start/stop/tick functions, waitForPong + scheduleReconnect hooks, start/stop call sites); node --check main.js OK.
• Verified: GUI npm test 257 (249 pass + 8 skipped), Python pytest 987 passed + 1 skipped incl. doc-count guards, import + CLI OK. CI test + test-windows PASS.

1/3.

[pm25coder]

Independent test report (Contributor, pm25coder):

[argszero]

✅ LGTM — cycle

2nd review (head 6f597ba — conflict-resolved merge of master into the branch, CI test + test-windows PASS on the resolved tree):

• Fresh local verification: GUI npm test 256 total (248 pass / 0 fail / 8 skipped), pytest 987 passed + 1 skipped, import + CLI OK.
• Conflict resolution: Agent.md GUI count now 256/127 (126 from #911's sidebar test removal + 1 new heartbeat test); no conflict markers left.
• Code: _heartbeatTick() every 15s — detects dropped daemon-level connections (previously no listener existed) and triggers scheduleReconnect; pings via waitForPong(3000, conn); no-pong path closes the conn and reconnects; stopHeartbeat() on reconnect + window close prevents timer stacking. Sound.

2/3.

[argszero]

✅ LGTM — cycle

Re-review (head updated to 6f597ba — master merged in by a parallel cycle):

• Heartbeat implementation intact after merge: startHeartbeat()/stopHeartbeat()/_heartbeatTick() — 15s ping on the daemon connection via waitForPong(3000, conn); no-pong or dropped connection → stopHeartbeat() + scheduleReconnect() (existing exponential backoff, renderer status dot updated truthfully).
• waitForPong conn override targets the daemon connection specifically; heartbeat guarded against stopping; started on ensureConnected success, stopped on scheduleReconnect entry and window-all-closed.
• Merge brought in #911 (sidebar removal) — no conflict; both features coexist. Agent.md GUI count on merged head = 256 (127 renderer smoke) matches actual npm test (256: 248 pass + 8 skipped).
• Verified on merged head: GUI npm test 256, Python pytest 987 passed + 1 skipped, import OK. CI test + test-windows PASS (run 32449393467).

2/3.

[argszero]

✅ LGTM — cycle

3rd review (head 6f597ba, unchanged since 2/3):

• Fresh local verification on this branch: GUI npm test 256 total (248 pass / 0 fail / 8 skipped), Python pytest 987 passed + 1 skipped, import + CLI OK.
• Heartbeat implementation intact: _heartbeatTick() every 15s pings the daemon connection via waitForPong(3000, conn); dropped connection or no pong → stopHeartbeat() + scheduleReconnect() (exponential backoff, renderer status dot updated truthfully). Guarded against stopping; started on ensureConnected success; stopped on scheduleReconnect entry and window-all-closed.
• CI test + test-windows PASS (run 32449393467).

3/3 — merging.