Merge branch 'working' into job_peek_lchen

job_peek_lchen: Add fetchfile feature (job output/error peek proxy)
working: HA/Raft infrastructure (consensus, replication, config mgmt)

Conflict resolution summary:
- controller.capnp: fetchfile @41, fetchfilereply @18, fetchfilemsg @30
- cluster.c: bifurcated OPCode_reply for fetchfile + config-push ACK
- job.c: kept full fetchfile pending-request subsystem (~183 lines)
- request.c: kept both xce_fetchfile_req() and XCE_RETRY_DEFAULTS
- helper.c: added missing preVoteRequest/preVoteReply mappings
- All 15 new test registrations (test_cbuf.c + 14 HA tests)

src/frontend/xcecli/models/jobs.go

@@ -3,8 +3,6 @@ package models
 import (
 	"encoding/json"
 	"fmt"
-	"time"
-	
 )
 
 const (
@@ -32,6 +30,7 @@ const (
 	HEADER_JOB_LAUNCH_TYPE     = "LAUNCH_TYPE"
 	HEADER_JOB_NUM_PROCESSORS  = "NUM_PROCESSORS"
 	HEADER_JOB_INTERACTIVE_URL = "INTERACTIVE_URL"
+	HEADER_JOB_PENDING_REASON  = "PENDING_REASON"
 
 	// second line
 	HEADER_JOB_R15S = "r15s"
@@ -114,10 +113,10 @@ type QueryJob struct {
 	TermTime           string        `json:"term_time"`
 	UserPriority       int           `json:"user_priority"`
 	DependCond         string        `json:"depend_cond"`
-	SubmitTime         string        `json:"submit_time"`
-	ReserveTime        time.Time     `json:"reserve_time"`
-	StartTime          string        `json:"start_time"`
-	EndTime            string        `json:"end_time"`
+	SubmitTime         int64         `json:"submit_time"`
+	ReserveTime        int64         `json:"reserve_time"`
+	StartTime          int64         `json:"start_time"`
+	EndTime            int64         `json:"end_time"`
 	JobRusage          string        `json:"job_rusage"`
 	MaxMem             float64       `json:"max_mem"`
 	AvgMem             float64       `json:"avg_mem"`
@@ -210,6 +209,7 @@ var JobFieldsMap = map[string]string{
 	HEADER_JOB_LAUNCH_TYPE:     "launch_type",
 	HEADER_JOB_NUM_PROCESSORS:  "num_processors",
 	HEADER_JOB_INTERACTIVE_URL: "interactive_job_url",
+	HEADER_JOB_PENDING_REASON:  "pending_reason",
 	//job_filter.HEADER_JOB_PRIORITY:     "job_priority",
 }
 
@@ -258,16 +258,23 @@ func (e ExecHosts) String() string {
 
 // UnmarshalJSON customizes the JSON parsing method, compatible with both string "-" and structure formats
 func (e *ExecHosts) UnmarshalJSON(data []byte) error {
+	// JSON null means no allocation — treat as empty
+	if string(data) == "null" {
+		e.HostSlots = []HostSlot{}
+		e.NumHosts = 0
+		return nil
+	}
+
 	// First try to parse as a string
 	var str string
 	if err := json.Unmarshal(data, &str); err == nil {
-		// If the string is "-", return an empty ExecHosts
-		if str == "-" {
+		// Empty string or "-" both mean no hosts
+		if str == "" || str == "-" {
 			e.HostSlots = []HostSlot{}
 			e.NumHosts = 0
 			return nil
 		}
-		// If it's any other string, treat it as a single hostname
+		// Any other non-empty string is a single hostname
 		e.HostSlots = []HostSlot{{HostName: str, NumSlots: 1}}
 		e.NumHosts = 1
 		return nil