TASK22028: phase 16 memory-bank updates

memory-bank/activeContext.md

@@ -500,6 +500,27 @@
 - Valid-hash spot-check:
     - `GET /api/file/setupcontainer?ident=c1&hash=<valid>` -> **200**.
 
+## Phase 16 hardening status (2026-03-13)
+
+- Continued on branch:
+    - `TASK22028-phase15-hardening-slice`
+- Added a consistency-only file-proxy hardening slice across:
+    - `pages/api/file/getbloblistproxy.js`
+    - `pages/api/file/getrepsblobproxy.js`
+    - `pages/api/file/getawaitingsubmissionfromblobproxy.js`
+- Changes focused on:
+    - standardized required-input guards via `hasValue`
+    - removed unused imports/dead constants from touched proxy handlers
+    - preserved existing response contracts and status semantics
+- Added focused test pack:
+    - `tests/phase16/service-behaviour.test.cjs`
+
+### Phase 16 validation evidence snapshot
+
+- phase6 parity + phase6–phase15 behavioural suites: pass
+- phase16 behavioural suite: pass (4/4)
+- lint: warnings only (pre-existing)
+
 ## Likely next steps
 
 1. Stabilize and simplify breadcrumb/back-link decision logic with focused regression checks.