docs(breadcrumbs): record map precedence and callback invariants

memory-bank/change-log.md

@@ -833,6 +833,33 @@ Follow-ups:
 - Next smaller slice candidate: helper-level assertion for missing/undefined representation dependency values yielding no renderer output regressions.
 - Next larger slice candidate: evaluate whether remaining `/newappeal` edge branch can be absorbed into mapped grouping without reducing readability or explicitness.
 
+### CL-22541-Z: breadcrumbs closure slice 1 — mapped-route precedence/callback invariants decision
+
+date: 2026-04-09  
+author: Cline  
+scope: `memory-bank/decisions.md`  
+type: change  
+rationale: Execute closure slice 1 by documenting explicit architectural invariants for breadcrumb mapped-route precedence and callback injection contracts so future refactors remain safe and auditable.  
+impact: Documentation/governance hardening only; no runtime route/auth/session/API/EN-CY/a11y behavior change.
+status: completed
+
+Summary:
+
+- Added `D-006` to `memory-bank/decisions.md`.
+- Captured accepted invariant contracts for:
+    - explicit breadcrumb map precedence ordering (9 groups)
+    - callback/state behavior dependency injection requirement (no ad-hoc inline reintroduction)
+    - structure test guardrails as contract checks for intentional future changes.
+
+Validation:
+
+- Documentation consistency review against current breadcrumb map structure and phase22 structure test expectations.
+
+Follow-ups:
+
+- Closure slice 2: add focused negative-path representation map/dependency tolerance test coverage.
+- Closure slice 3: resolve and guard remaining `/newappeal` inline edge branch treatment.
+
 ### CL-00X: 22500 `components/elements/index.js` Phase 1 helper extraction
 
 date: 2026-04-07