fix(agents): clamp zero bash job TTLs (#102855)

Co-authored-by: 0668000787 <ma.weibin@xydigit.com>

src/agents/bash-process-registry.test.ts

@@ -14,6 +14,7 @@ import {
   markBackgrounded,
   markExited,
   resetProcessRegistryForTests,
+  setJobTtlMs,
   tail,
 } from "./bash-process-registry.js";
 import { createProcessSessionFixture } from "./bash-process-registry.test-helpers.js";
@@ -171,6 +172,34 @@ describe("bash process registry", () => {
       },
     ]);
   });
+
+  it("clamps a zero retention TTL to one minute", () => {
+    vi.useFakeTimers();
+    try {
+      vi.setSystemTime(new Date("2026-07-09T00:00:00Z"));
+      setJobTtlMs(0);
+
+      const session = createRegistrySession({
+        id: "zero-ttl",
+        maxOutputChars: 100,
+        pendingMaxOutputChars: 30_000,
+        backgrounded: true,
+      });
+      addSession(session);
+      markExited(session, 0, null, "completed");
+
+      vi.advanceTimersByTime(30_000);
+      expect(listFinishedSessions()).toHaveLength(1);
+
+      vi.advanceTimersByTime(60_000);
+      expect(listFinishedSessions()).toHaveLength(0);
+    } finally {
+      resetProcessRegistryForTests();
+      setJobTtlMs(30 * 60 * 1000);
+      resetProcessRegistryForTests();
+      vi.useRealTimers();
+    }
+  });
 });
 
 describe("cursorKeyMode", () => {

src/agents/bash-process-registry.ts

@@ -17,7 +17,7 @@ const MAX_JOB_TTL_MS = 3 * 60 * 60 * 1000; // 3 hours
 const DEFAULT_PENDING_OUTPUT_CHARS = 30_000;
 
 function clampTtl(value: number | undefined) {
-  if (!value || Number.isNaN(value)) {
+  if (value === undefined || Number.isNaN(value)) {
     return DEFAULT_JOB_TTL_MS;
   }
   return Math.min(Math.max(value, MIN_JOB_TTL_MS), MAX_JOB_TTL_MS);