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* fix(daemon/acp): terminate ACP child after clean prompt completion (Bug B / #1265) Some ACP agents (notably Devin for Terminal) keep the child process alive after stdin closes, waiting for the next prompt. Open Design spawns a fresh agent per chat turn and relies on child.on('close') to finalize the run, so without an explicit signal-driven shutdown the chat sits stuck in the 'working' state indefinitely. Three small, targeted changes: - apps/daemon/src/acp.ts: After a clean session/prompt response we schedule a 500ms grace period and then SIGTERM the child. This mirrors the pattern detectAcpModels() already uses after model discovery. The grace period leaves well-behaved agents that exit on stdin.end() unaffected. - apps/daemon/src/acp.ts: New completedSuccessfully() method on the session handle reports whether the prompt resolved without a fatal error or abort, so the consumer can distinguish 'clean signal exit' from 'genuine signal failure'. - apps/daemon/src/server.ts: child.on('close') now treats a SIGTERM exit as 'succeeded' when acpSession.completedSuccessfully() is true. - apps/web/src/providers/daemon.ts: Trust the server's authoritative endStatus; the signal/non-zero-code safety net no longer overrides an explicit 'succeeded' status, so the chat doesn't surface a fake 'agent exited with signal SIGTERM' error after a clean ACP run. Daemon tests cover the SIGTERM grace timer, clean early-exit (timer cleared), and completedSuccessfully() abort/error states. Manual UI test on plain main + this fix confirms Devin chats now return to ready automatically after Done · ... * fix(daemon/connectionTest): treat ACP clean SIGTERM as success Codex review on #1286 caught that the new SIGTERM in attachAcpSession breaks ACP connection tests for agents that don't shut down on stdin.end() (the exact Devin behavior the patch targets). attachAgentStreamHandlers() in connectionTest.ts now also respects acpSession.completedSuccessfully(), mirroring the same check we apply in server.ts. Without this, a clean prompt response followed by our SIGTERM would set winner.signal === 'SIGTERM', flip exitedCleanly to false, and the connection test would report 'agent_spawn_failed' even when the agent had returned a healthy response. Also widened the AgentSpawnHandle type so completedSuccessfully is visible on the structural type used inside connectionTest.ts. All 56 daemon tests still pass; typecheck + guard clean. * fix(daemon/acp): narrow ACP success-on-signal override to forced-SIGTERM Looper review on #1286 caught that the success predicate was broader than the SIGTERM case it was meant to handle. `completedSuccessfully()` flips to true as soon as the ACP `session/prompt` response is processed, but it does not say why the child later closed. With the broad predicate, an ACP agent that returned a prompt result and then exited with code 1 (or was killed by SIGKILL/SIGSEGV) was still marked 'succeeded', regressing the existing close-status behavior for genuine post-response process failures. Scope the override to the exact forced-shutdown shape this PR introduces: code === null && signal === 'SIGTERM' && acpCleanCompletion Applied to both `server.ts` (chat run finalization) and `connectionTest.ts` (connection-test classification). Any other post-response failure now falls through to 'failed' / 'agent_spawn_failed' as before. All 59 daemon tests still pass; typecheck + guard clean. * fix(web/daemon): only bypass exit-code safety net on explicit server success Looper review on #1286 caught that the previous web change trusted `endStatus === 'succeeded'` absolutely, but `endStatus` can become 'succeeded' in two distinct ways: 1. The SSE end event explicitly carries `status: 'succeeded'` (authoritative server declaration). 2. The end event omits or has an invalid `status` field and the handler silently falls back to 'succeeded' as a local default. Both produced `endStatus === 'succeeded'` in the existing code, so the new safety-net bypass treated them identically. That regressed backward compat: a compatible or older daemon emitting an end event like `{code:1}` or `{code:null,signal:"SIGTERM"}` with no `status` would suddenly skip the failure banner. Track explicit success separately via `serverDeclaredSuccess`, set true only when: - The SSE end event has `status === 'succeeded'`, or - The fallback `fetchChatRunStatus` REST path returns `status === 'succeeded'` (which the existing `isChatRunStatus()` guard already proves is explicit). The safety net is now bypassed only on that explicit signal; the local-fallback success path still reaches the exit-code/signal check so real failures surface as before. Adds three web-side regression tests in `apps/web/tests/providers/sse.test.ts`: - Explicit `status: 'succeeded'` + SIGTERM → onDone called, no error - End event with `{code:1}` and no `status` → onError surfaces 'agent exited with code 1' as before - End event with `{code:null,signal:'SIGTERM'}` and no `status` → onError surfaces 'agent exited with signal SIGTERM' as before `pnpm guard` + daemon typecheck clean; 27/27 SSE tests pass (up from 24).