docs(kernel): ratify diagnostic ComputeBudgetPolicy envelope

docs/adr/ADR-0227-compute-budget-policy-envelope.md

@@ -1,6 +1,6 @@
 # ADR-0227: ComputeBudgetPolicy Envelope
 
-**Status:** Proposed
+**Status:** Accepted
 
 **Date:** 2026-06-22
 
@@ -8,6 +8,14 @@
 
 **Depends on:** ADR-0226 and PR #865
 
+## Ratification note
+
+Accepted for staged implementation.
+
+This ADR authorizes exactly one next implementation PR: a diagnostic-only `ComputeBudgetDecision` read adapter over `SearchGateDecision`.
+
+This authorization does not include `GeometricSearchRun`, search execution, candidate generation, repair, Workbench implementation, serving/runtime behavior, teaching/proposal/report/eval mutation, answer production, or any unreviewed artifact mutation. Those remain separately gated by future PRs.
+
 ---
 
 ## 1. Summary