plane(1.6): reconciler bound recorded -- 489 lines, bound moves to 550 in 2.4

reconciler.py: 477 lines at 6bd44ca, 489 after 1.2 (the profile parameter of
run() and its docstring). Task 2.4 adds the Delivery wiring (about +25) while
the receiver path is kept for group 2, and 2.6 removes the receiver wiring
(about -20): projected 514 during group 2, 494 after 2.6. The estimate crosses
500 while both paths coexist, so 2.4 moves tests/test_plane_reconciler.py's
bound to 550 with the reason in the assertion message; 2.6 records the final
count. Numbers in benchmarks/measurements/2026-10-02-k8s-01-profile/record.json
(record 01, drafted here, completed by 1.8).

Gates: no file a test or linter reads changed since the 1.5 gate (pytest 2010
passed, 42 skipped, exit 0; ruff 0; format 0; mypy 0).

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo

.kiro/specs/plane-on-kubernetes/tasks.md

@@ -49,7 +49,7 @@ go-ahead** with a ceiling; steps that need a hand on a cluster that does not exi
   - Evidence: `record.json` says whether Substrate places by resource fit (`placement: fit|any`). `any` selects
     the design's fallback for group 5 and is written into `design.md` section 4 before group 5 starts.
   - _Requirements: 4.1_
-- [ ] 1.6 Reconciler bound (open question 7)
+- [x] 1.6 Reconciler bound (open question 7) -- 489 lines after 1.2; projected 514 during group 2: the bound moves to 550 in 2.4
   - Record `wc -l src/openultrasast/plane/reconciler.py` (477 at 17ac7ad) and the lines task 2.4 may add
     (receiver wiring removed: `-12`, `Delivery` calls: `+8` estimated). If the estimate crosses 500, the bound
     in `tests/test_plane_reconciler.py:803` moves to 550 in task 2.4 with the reason in the assertion message.