refactor(relay): extract shared relay policy presets across endpoints

memory-bank/change-log.md

@@ -1407,3 +1407,40 @@ Validation:
 Follow-ups:
 
 - Optional next slice: extract shared relay policy presets into a constants module and reference them from all relayGet endpoints to reduce duplication.
+
+---
+
+### CL-038: TASK22242 P2-S3 closure slice — shared relay policy presets extraction
+
+date: 2026-03-24
+author: Cline
+scope: `pages/api/middleware/relayPolicyPresets.js`, `pages/api/endpoint/{getaccounts_api,getemailaccountcheck_api,getpreferredlanguage_api,getpersonalaccount_api,getlogin_api,getportallogin_api,getportalloginproxy_api,getbasicsearch_api,getbasicsearchpaged_api,getadvancedsearch_api,getadvancedsearchpaged_api,getportalmoduledetails_api,getportalmoduledetailsproxy_api,getmycases_api,getmyrepresentations_api,getawaitingsubmission_api,getrepresentations_api,getwatchedcases_api}.js`, `tests/phase21/_shared.cjs`
+type: change
+rationale: Complete the planned P2-S3 final maintainability slice by centralizing repeated relay timeout/retry policy objects into shared presets used consistently across all targeted relayGet endpoints.
+impact: Eliminates duplicated policy literals, reduces drift risk, and preserves endpoint contracts/behavior by reusing equivalent policy values.
+status: completed
+
+Summary:
+
+- Added new middleware constants module:
+    - `pages/api/middleware/relayPolicyPresets.js`
+    - `RELAY_POLICY_STRICT_LOGIN`
+    - `RELAY_POLICY_LOOKUP`
+    - `RELAY_POLICY_BOUNDED_READ`
+    - `RELAY_POLICY_SEARCH_PAGED`
+- Refactored 18 relayGet endpoints to import and use shared presets instead of inline `relayPolicy` object literals:
+    - lookup profile: `getaccounts`, `getemailaccountcheck`, `getpreferredlanguage`, `getpersonalaccount`, `getportalloginproxy`
+    - strict login profile: `getlogin`, `getportallogin`
+    - bounded read profile: `getbasicsearch`, `getportalmoduledetails`, `getportalmoduledetailsproxy`, `getmycases`, `getmyrepresentations`, `getawaitingsubmission`, `getrepresentations`, `getwatchedcases`
+    - search paged profile: `getbasicsearchpaged`, `getadvancedsearch`, `getadvancedsearchpaged`
+- Updated phase21 VM test harness (`tests/phase21/_shared.cjs`) to inject preset constants so endpoint contract tests continue to execute with import-stripped modules.
+
+Validation:
+
+- `node tests/phase21/endpoint-handler-contract.test.cjs` -> pass (164/164)
+- `node tests/phase21/relay-forwarding-hardening.test.cjs` -> pass (10/10)
+- `npm run lint` -> warnings only (pre-existing `react-hooks/exhaustive-deps`; no new lint errors)
+
+Follow-ups:
+
+- P2-S3 planned slices are now complete; no further mandatory relay policy rollout slices remain for this stream.