fix(cron): apply create-time origin resolution to the update path too

Review caught a real gap: action='update' also accepts deliver, and the
tool description explicitly steers agents toward update-over-create — so
a cron-context agent updating a job to deliver='origin' would recreate
exactly the dangling literal-origin shape the create-path resolution
prevents (stored 'origin' on an origin-less job → fire-time home-channel
guessing or silent drop).

Wrap the update site in the same resolver. Semantics follow the create
precedent: in cron context, 'origin' means 'my run's target', resolved
concretely at mutation time; outside cron context updates are
byte-identical to before.

tests/cron/test_cron_created_delivery.py

@@ -145,6 +145,40 @@ class TestCronContextDeliveryResolution:
         assert "origin" not in [p.strip() for p in stored.split(",")]
 
 
+class TestCronContextUpdatePath:
+    def test_update_deliver_origin_resolves_in_cron_context(self, temp_cron_home):
+        """The update action must apply the same resolution as create — a
+        cron agent updating deliver='origin' would otherwise recreate the
+        dangling literal-origin shape on an origin-less job."""
+        from tools.cronjob_tools import cronjob
+        from cron.jobs import get_job
+
+        tokens, extra = _enter_cron_context("telegram", "-100123456", "17")
+        try:
+            created = _create(deliver="local")
+            result = json.loads(
+                cronjob(action="update", job_id=created["job_id"], deliver="origin")
+            )
+        finally:
+            _exit_cron_context(tokens, extra)
+        assert result["success"] is True
+        job = get_job(created["job_id"])
+        stored = str(job.get("deliver", ""))
+        assert "origin" not in [p.strip() for p in stored.split(",")]
+        assert stored == "telegram:-100123456:17"
+
+    def test_update_deliver_outside_cron_context_unchanged(self, temp_cron_home):
+        from tools.cronjob_tools import cronjob
+        from cron.jobs import get_job
+
+        created = _create(deliver="local")
+        result = json.loads(
+            cronjob(action="update", job_id=created["job_id"], deliver="origin")
+        )
+        assert result["success"] is True
+        assert get_job(created["job_id"]).get("deliver") == "origin"
+
+
 class TestNonCronContextUnchanged:
     def test_chat_session_create_keeps_literal_origin(self, temp_cron_home):
         # No cron_session var — ordinary chat/CLI create. Existing semantics:

tools/cronjob_tools.py

@@ -1358,7 +1358,9 @@ def cronjob(
             if name is not None:
                 updates["name"] = name
             if deliver is not None:
-                updates["deliver"] = _normalize_deliver_param(deliver)
+                updates["deliver"] = _resolve_cron_context_deliver(
+                    _normalize_deliver_param(deliver)
+                )
             if skills is not None or skill is not None:
                 canonical_skills = _canonical_skills(skill, skills)
                 updates["skills"] = canonical_skills