feat(scheduler-controller-msg-gap): store job rusage on the job + free leaked op payloads (tasks 5.5, 5.8; bug-765 G-5/G-3)

5.5 (Req 6 / G-5): the JOB_RUSAGE notify path called the plugin but never
stored the usage data — xce_sched_job_t had no rusage field (UB-6.1 unmet).
- Add xce_job_rusages_t* rusages to xce_sched_job_t.
- New sched_apply_job_rusage() stores the report ON the job (ownership
  transferred), replacing any prior via free_JobRusages_ptr; -ENOENT unknown,
  -EINVAL NULL. Dequeue NULLs the request pointer on success; kill_sched_job
  releases job->rusages.

5.8 (G-3): sched_pend_update_killer left five new-op payloads on empty
break cases — a per-message leak since ownership is transferred on enqueue.
- Free each with the exact generated deep-freer: free_QueueConf_ptr,
  free_Resource_ptr[], free_ResourceVal_ptr[], free_ResValList_ptr,
  free_JobRusages_ptr. Safe: handlers nullify on enqueue, makeResource copies
  via makeInstance, dequeue copies values (no aliasing).

Tests: sched_job_update_test 7/7 (3 update + 4 rusage), regression
sched_test 15/15, ASAN clean (no bad-free/double-free).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/scheduler/include/sched/types.h

@@ -93,6 +93,10 @@ typedef struct xce_sched_job_ {
     uint32_t             maxtasks;
     xce_job_alloc_t*     allocs;
     xce_job_account_t*   accounts;
+    /* Latest resource-usage report from the controller (Req 6 / bug-765 G-5).
+     * Owned by the job: replaced on each JOB_RUSAGE update, freed in
+     * kill_sched_job. NULL until the first rusage report. */
+    xce_job_rusages_t*   rusages;
 } xce_sched_job_t;
 
 typedef struct {