docs(buglog): P0 defects fixed (bug-1936..bug-1955; 1936 and 1955 partial), bug-1956 cannot-reproduce

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.wolf/bugs/bug-1955.md

@@ -1,8 +1,8 @@
 ---
 id: "bug-1955"
-status: "open"
+status: "partial"
 status_updated: "2026-10-10"
-status_note: "newly logged"
+status_note: "covers a signal arriving after this host accepted the runtasks request; a control that reaches a remote host before its runtasks request arrives is still dropped there (needs a controller-side or pre-start record)"
 component: "worker"
 severity: "wrong-result"
 timestamp: "2026-10-10T08:46:10Z"
@@ -11,6 +11,7 @@ occurrences: 1
 files: ["src/worker/src/controller_connector.c"]
 tags: ["worker", "job-control", "parallel", "signal"]
 related: ["bug-1942", "bug-1908"]
+fix_commits: ["d3da3140"]
 ---
 
 # bug-1955: xcecd drops a signal for a remote task of a multi-host job that is still starting
@@ -51,15 +52,16 @@ starts can miss some of its remote tasks, which keep running.
 - Frequency: deterministic by code reading (not yet run)
 - Evidence: the code quoted in Description; no logs kept.
 ## Root cause
-TODO: required for fixed/partial
+Only the head-host start path opened the pending-signal window (`pending_signal_start`, `controller_connector.c`, bug-1908); `handle_runtasks()` queued remote tasks without it, so a signal arriving before the task's worker entry registered hit "Failed to find worker" and was dropped.
 
 ## Fix
-TODO: required for fixed/partial
+`handle_runtasks()` calls `pending_signal_start(jobid)` before `submit_fork_task()` and takes it back if queuing fails; the existing RUNNING transition (`xcecd_worker_utils.c`, bug-1908) delivers the kept signal to the task.
 
 ## Verification
-- Test: TODO: name + file; RED before the fix, GREEN after
-- Suites: TODO: suite results and build profile
-- Live: TODO: soak/deploy run, or n/a and why
+- Test: `test_jobcontrol_signal_for_queued_remote_task_is_kept` (`src/worker/testsuite/test_controller_connector.c`): RED `:1631: FAIL: Expected 0 Was -1. the kill must not be dropped`, GREEN after (32 tests, 0 failures).
+- Suites: `xce-build.sh all asan xce.build --incremental` on the merged branch, 2026-10-10: all C suites Ok 155 / Fail 0, frontend Go unit tests ok, xceadmin tests ok; apiserver `CGO_ENABLED=0 go test ./...` (incl. middleware, router, cmd) ok
+- Live: n/a: unit/fixture-level verification only; no live deployment was run (follow-up)
 
 ## References
-- Related: none
+- Fix commit: `d3da3140` (on `scheduler-framework`; worker-branch original in the merge)
+- Review: `.kiro/reviews/project-gap-review-2026-10-10.md`