docs(kiro): archive the superseded roadmap; status notes on specs

A4: roadmap-2026-09-04.md moves to .kiro/archive/steering/ so it no longer
loads as steering (roadmap.md and safety-net.md replaced it); roadmap.md's
pointer follows it. overview.md's spec table is recounted from tasks.md and
spec.json (adds ai-service-plane, harnessx-removal, learned-decision-engine,
pre-push-safety-net; drops the stale "active one"), and the module line now
cites the regenerated audit: 150 modules, 145 load-bearing, 5 standalone,
0 orphaned; 1,964 tests collected.

A5: a dated status note at the top of the requirements (or brief) of 16
specs: retired, superseded, dormant or complete, and for
model-grounded-detection the removal of judge/calibrate/execution (closing
the Req 10 execution-tier option). spec.json phase corrected to
implementation-complete where every task is checked (model-grounded-
detection, propose-adjudicate-prove, tree-sitter-overlay-extra,
corpus-seeded-mechanisms, pair-corpus-honesty); openrouter-sast-harness gets
a spec.json with status retired. Nothing deleted, no spec moved.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01EmM1j46qgKMh3zqD1QMwEo

.kiro/specs/model-grounded-detection/requirements.md

@@ -1,5 +1,7 @@
 # Requirements Document: model-grounded-detection
 
+> **Status 2026-10-02:** complete, 16 of 16 tasks (spec.json phase corrected to `implementation-complete`). On 2026-10-02 three of its modules were deleted because nothing imported them: `model/judge.py` (Req 8; `model/pipeline.py` does the judging), `model/calibrate.py` (Req 9; the decision engine's `learn/calibrate.py` is the live calibration) and `model/execution.py`. Deleting `execution.py` closes the Req 10 execution-tier option: a future execution tier is a new design, not this seam.
+
 ## Introduction
 
 This feature supersedes `learning-harness` and `constrained-detector`. It replaces the assumption that the LLM

.kiro/specs/model-grounded-detection/spec.json

@@ -1,9 +1,9 @@
 {
   "feature_name": "model-grounded-detection",
   "created_at": "2026-09-08T00:00:00Z",
-  "updated_at": "2026-09-08T10:00:00Z",
+  "updated_at": "2026-10-02T00:00:00Z",
   "language": "en",
-  "phase": "implementation",
+  "phase": "implementation-complete",
   "approvals": {
     "requirements": {
       "generated": true,