fix(controller,apiserver,xcecli): expose job CPU peak and efficiency to the apiserver and xcecli (bug-1736)

The controller computed run usage (CPU time, memory, CPU peak and
efficiency, LSF bjobs -l definitions) but the capnp Job struct had no
field for it, so the job pushed to the apiserver never carried it, and
snapshots (the same struct) dropped it: a job restored from a checkpoint
lost its accumulated usage.

- controller.capnp: Job.runUsage @13 (JobRunusage); old entries decode
  with no run usage.
- apiserver: map run_usage into JobInfo; max_mem, avg_mem, used_mem,
  cpu_time, peak_cpu, peak_cpu_time, peak_cpu_duration, mem_efficiency,
  avg_cpu_efficiency, peak_cpu_efficiency become queryable columns.
- xcecli: -o fields MAX_MEM, AVG_MEM, MEM_EFFICIENCY, CPU_PEAK,
  CPU_PEAK_DURATION, CPU_EFFICIENCY, CPU_PEAK_EFFICIENCY (CPU_TIME now
  renders too), and a MEMORY USAGE / CPU USAGE block in jobs list -l.

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

src/frontend/apiserver/backend/convert_pure.go

@@ -263,6 +263,23 @@ type rawHostSlot struct {
 	slots int
 }
 
+// rawRunUsage mirrors the C xce_job_runusage_t job-level fields used by the
+// Go model (bug-1736): accumulated CPU time and memory, and the CPU peak and
+// efficiency values the controller computes with LSF bjobs -l definitions
+// (efficiencies in percent, memory in MB as the worker reports it).
+type rawRunUsage struct {
+	maxMem            float64
+	avgMem            float64
+	usedMem           float64
+	cpuTime           int
+	peakCPUTime       int
+	peakCPUDuration   int
+	memEfficiency     float64
+	avgCPUEfficiency  float64
+	peakCPUEfficiency float64
+	peakCPU           float64
+}
+
 // rawJobData mirrors the C xce_job_t fields used by the Go model.
 type rawJobData struct {
 	jobID      int64
@@ -274,6 +291,7 @@ type rawJobData struct {
 	finishTime int64
 	submit     *rawSubmitData
 	execHosts  []rawHostSlot
+	runUsage   *rawRunUsage // nil until the job's first usage report
 }
 
 // rawWorkerData mirrors the C xce_worker_t fields used by the Go model.
@@ -363,6 +381,18 @@ func rawJobToModel(r rawJobData) *models.JobInfo {
 		data, _ := json.Marshal(execHostsJSON{HostSlots: slots, NumHosts: len(slots)})
 		info.ExecHosts = models.Jsonb{String: string(data)}
 	}
+	if u := r.runUsage; u != nil {
+		info.MaxMem = u.maxMem
+		info.AvgMem = u.avgMem
+		info.UsedMem = u.usedMem
+		info.CPUTime = u.cpuTime
+		info.PeakCPU = u.peakCPU
+		info.PeakCPUTime = u.peakCPUTime
+		info.PeakCPUDuration = float64(u.peakCPUDuration)
+		info.MemEfficiency = u.memEfficiency
+		info.AvgCPUEfficiency = u.avgCPUEfficiency
+		info.PeakCPUEfficiency = u.peakCPUEfficiency
+	}
 	return info
 }