fix(harness): jobrun and setpend report an unknown job as not found (bug-1907)

The controller acknowledges job dispatch and pend-reason requests with
status 0 before looking the job up, and the scheduler relies on that
early acknowledgement, so the harness now looks the job up first
(job_exists_or_report) and reports "not found" like the other
single-job commands (job-array-one-based-index Req 4.7, 5.13).

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

src/harness/test.c

@@ -3257,6 +3257,49 @@ static int jobinfo_thunk(void* ctxp)
     return call->rc;
 }
 
+/* bug-1907: the controller acknowledges jobrun (job dispatch) and setpend
+ * (pend reason) with status 0 before it looks the job up -- the scheduler
+ * relies on that early acknowledgement -- so those commands look the job
+ * up first and report "not found" like every other single-job command
+ * (job-array-one-based-index Req 4.7, 5.13). Returns 0 when the job
+ * exists, -ENOENT after reporting it missing, or the RPC error. */
+static int job_exists_or_report(const char* cmd, uint64_t jobid,
+                                const char* arg, int had_index)
+{
+    jobinfo_call_t* call = (jobinfo_call_t*)calloc(1, sizeof(*call));
+    xce_job_t*      job;
+    int             rc;
+
+    if (call == NULL) {
+        return -ENOMEM;
+    }
+
+    call->conn  = active_ctx->ctx;
+    call->jobid = jobid;
+
+    rc = xcetest_run_interruptible(jobinfo_thunk, call);
+    if (rc == -EINTR) {
+        /* `call` now belongs to the still-running worker thread */
+        errno = EINTR;
+        perror(cmd);
+        return rc;
+    }
+
+    job = call->job;
+    free(call);
+
+    rc = cmdutil_job_lookup_report(stderr, cmd, rc, job, arg, had_index);
+    if (rc == -ENOENT) {
+        errno = ENOENT;
+    } else if (rc < 0) {
+        cmdutil_rpc_error("xcecli_jobinfo", rc);
+    }
+    if (job != NULL) {
+        free_Job_ptr(&job);
+    }
+    return rc;
+}
+
 int cmd_jobinfo(int argc, char* argv[])
 {
     int           opt;
@@ -3512,6 +3555,11 @@ int cmd_jobrun(int argc, char* argv[])
         return -1;
     }
 
+    rc = job_exists_or_report("jobrun", jobid, jobarg, had_index);
+    if (rc < 0) {
+        return rc;
+    }
+
     {
         jobrun_call_t* call = (jobrun_call_t*)calloc(1, sizeof(*call));
 
@@ -5165,6 +5213,12 @@ int cmd_setpend(int argc, char* argv[])
         return -1;
     }
 
+    rc = job_exists_or_report("setpend", preason.jobid, jobarg, had_index);
+    if (rc < 0) {
+        erase_job_preason(&jreasons);
+        return rc;
+    }
+
     {
         setpend_call_t* call = (setpend_call_t*)calloc(1, sizeof(*call));