docs(specs): rename parjob-capacity-partitioning to parjob-placement, init pend-reason-push-dedup

parjob-placement now covers full LSF-style parallel placement: task
range (-n min,max), capacity-driven partitioning, span[ptile=n],
span[hosts=1], span[block=n] and a host-count limit. bug-1931 points to
it for the full task-range behaviour.

pend-reason-push-dedup: skip pushing a job's pend reason to the
controller when it equals the last one the controller accepted.

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

.kiro/specs/pend-reason-push-dedup/spec.json

@@ -0,0 +1,24 @@
+{
+  "feature_name": "pend-reason-push-dedup",
+  "created_at": "2026-10-09T08:19:27Z",
+  "updated_at": "2026-10-09T08:19:27Z",
+  "language": "en",
+  "phase": "initialized",
+  "approvals": {
+    "requirements": {
+      "generated": false,
+      "approved": false
+    },
+    "design": {
+      "generated": false,
+      "approved": false
+    },
+    "tasks": {
+      "generated": false,
+      "approved": false
+    }
+  },
+  "ready_for_implementation": false
+}
+
+