fix: do not delete active Jobs on SIGTERM — leave for orphan reattach (FAR-107)

Root cause of Nancy's k8s_job_deleted_externally false positive: the
paperclip server itself receives SIGTERM during rolling deploys,
evictions, scale-down, etc.  The previous SIGTERM handler iterated
activeJobs and deleted every Job before exiting, which surfaced in the
in-flight heartbeat as "K8s Job was deleted externally" — even though
nothing external touched it.

With reattachOrphanedJobs=true (default), this is exactly the wrong
behaviour: leaving the Jobs alive lets the next paperclip process
discover them via the orphan-classification path and reattach their
log streams.  With reattachOrphanedJobs=false the operator opted into
manual cleanup, so we still must not auto-delete.

The Job's ownerReference (FAR-15) keeps the prompt Secret tied to the
Job, so both survive together and TTL handles cleanup on natural
completion.  Test rewritten to assert the new contract: SIGTERM must
not touch K8s Jobs.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/server/execute.test.ts

@@ -1771,7 +1771,7 @@ describe("execute: SIGTERM handler best-effort cleanup", () => {
     vi.useRealTimers();
   });
 
-  it("deletes the active Job when SIGTERM fires during execution", async () => {
+  it("does NOT delete active Jobs on SIGTERM — leaves them for orphan reattach (FAR-107)", async () => {
     // Mock process.kill to prevent the test process from actually being killed.
     const killSpy = vi.spyOn(process, "kill").mockImplementation(() => true);
 
@@ -1782,17 +1782,19 @@ describe("execute: SIGTERM handler best-effort cleanup", () => {
     // Flush microtasks through the async setup chain: getSelfPodInfo, listJobs,
     // readSkillEntries, prepareBundle, createJob, onLog, activeJobs.add(), and
     // ensureSigtermHandler() all complete before the try block enters streaming.
-    // 30 rounds is more than enough for the ~7 sequential await points.
     for (let i = 0; i < 30; i++) await Promise.resolve();
 
-    // Emit SIGTERM — the process.once handler fires synchronously and kicks off
-    // async cleanup (deleteNamespacedJob). The mock resolves immediately.
+    // Reset deleteJob spy after setup so we can detect any SIGTERM-driven calls.
+    mockBatchDeleteJob.mockClear();
+
+    // Emit SIGTERM — the handler must re-raise to the default handler without
+    // touching the K8s Job.  Deleting the Job here would surface as
+    // k8s_job_deleted_externally in the in-flight run (FAR-107).
     process.emit("SIGTERM");
 
-    // Flush microtasks for deleteJob to resolve and the .then(process.kill) to run.
     for (let i = 0; i < 10; i++) await Promise.resolve();
 
-    expect(mockBatchDeleteJob).toHaveBeenCalled();
+    expect(mockBatchDeleteJob).not.toHaveBeenCalled();
     expect(killSpy).toHaveBeenCalledWith(process.pid, "SIGTERM");
 
     killSpy.mockRestore();

src/server/execute.ts

@@ -58,30 +58,20 @@ function ensureSigtermHandler(): void {
   if (sigtermHandlerRegistered) return;
   sigtermHandlerRegistered = true;
   process.once("SIGTERM", () => {
-    const jobs = [...activeJobs];
-    void Promise.allSettled(
-      jobs.map(async (ref) => {
-        try {
-          const batchApi = getBatchApi(ref.kubeconfigPath);
-          await batchApi.deleteNamespacedJob({
-            name: ref.jobName,
-            namespace: ref.namespace,
-            body: { propagationPolicy: "Background" },
-          });
-        } catch { /* best-effort */ }
-        if (ref.promptSecretName && ref.promptSecretNamespace) {
-          try {
-            const coreApi = getCoreApi(ref.kubeconfigPath);
-            await coreApi.deleteNamespacedSecret({
-              name: ref.promptSecretName,
-              namespace: ref.promptSecretNamespace,
-            });
-          } catch { /* best-effort */ }
-        }
-      }),
-    ).then(() => {
-      process.kill(process.pid, "SIGTERM");
-    });
+    // Do NOT delete active K8s Jobs on SIGTERM (FAR-107).  Paperclip itself
+    // receives SIGTERM during rolling deploys, evictions, scale-down, etc.
+    // Deleting the Jobs we own there causes the in-flight heartbeat to surface
+    // a false-positive `k8s_job_deleted_externally` error and tears down work
+    // the user expected to keep running.
+    //
+    // The correct behaviour with `reattachOrphanedJobs=true` (default) is to
+    // leave the Jobs alive: the next paperclip process discovers them via the
+    // orphan-classification path and reattaches their log streams.  When
+    // `reattachOrphanedJobs=false` the operator explicitly opted into manual
+    // cleanup and should not have us auto-deleting either.  The owning Job's
+    // ownerReference (FAR-15) keeps the prompt Secret tied to the Job, so
+    // both survive together and TTL cleans them up after natural completion.
+    process.kill(process.pid, "SIGTERM");
   });
 }