docs(scheduler-snapshot-job-allocation): sync spec.json phase to implementation-complete

All 11 leaf tasks (1.1-4.5) are checked done and the feature was
closed out by its own commits (5948e079, b64682dc); spec.json still
read "tasks-generated" -- same phase/reality lag class already fixed
for other specs this week.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019QxaSzHRB7pmYFp4cVnwkA

.kiro/specs/scheduler-snapshot-job-allocation/spec.json

@@ -1,9 +1,9 @@
 {
   "feature_name": "scheduler-snapshot-job-allocation",
   "created_at": "2026-08-27T09:07:31Z",
-  "updated_at": "2026-08-27T10:48:20Z",
+  "updated_at": "2026-08-30T08:10:00Z",
   "language": "en",
-  "phase": "tasks-generated",
+  "phase": "implementation-complete",
   "approvals": {
     "requirements": {
       "generated": true,