test(harness): add fileClient default helper injections

memory-bank/change-log.md

@@ -2312,3 +2312,37 @@ Validation:
 Follow-ups:
 
 - Optional next bounded slice: evaluate whether additional `documentDirectService` file-route call sites can adopt `fileClient` without altering current behavior contracts.
+
+---
+
+### CL-066: TASK22260 next slice — service harness parity for fileClient helper injections
+
+date: 2026-03-25
+author: Cline
+scope: `tests/serviceHarness.cjs`
+type: change
+rationale: Follow the previous `fileClient` extraction with a bounded harness-compatibility slice so legacy VM-based service behavioural suites continue to execute without requiring per-test manual injections.
+impact: Restores migration-era behavioural regression stability (phase7) by aligning shared harness defaults with newly introduced file client helper symbols.
+status: completed
+
+Summary:
+
+- Updated shared test harness defaults in `tests/serviceHarness.cjs` to inject file-client compatible helpers when not explicitly provided:
+    - `getFileJson` (delegates to default `getJson`)
+    - `getSignedFileJson` (signs via `buildHashedQueryUrl` then calls `requestJson` with GET config)
+    - `downloadFileBlob` (calls `requestJson` with GET + `responseType: "blob"`)
+- This preserves existing VM import-stripping strategy while preventing `ReferenceError` in migrated services that import from `../clients/fileClient`.
+
+Validation:
+
+- `node tests/phase7/service-behaviour.test.cjs` -> pass (12/12)
+- `node tests/phase22/index.test.cjs` -> pass
+    - core-token: 2/2
+    - client-utils: 5/5
+    - file-client: 3/3
+    - phase22 combined: pass
+- `npm run lint` -> warnings only (pre-existing `react-hooks/exhaustive-deps`; no new lint errors)
+
+Follow-ups:
+
+- Optional next bounded slice: add a focused phase6/phase7 behavioural assertion for `documentDirectService.downloadBlob` to explicitly lock the `downloadFileBlob` delegation contract.