Sessions 7e+7f: Grade adapter, normalize consolidation, computeFeatures, analyzeViaEngine1, scan/parlay migrated to engine1

docs/SYSTEM-MANIFEST.md

@@ -411,8 +411,22 @@ No circular imports detected.
 ### ARCH — Architecture
 
 - **[ARCH-1] Dual grading paths.** Severity: Medium. Status:
-  **PARTIAL in Session 7e** — Step 1 of the migration (the adapter)
-  is complete and tested. Steps 2-6 deferred per ESCAPE HATCH.
+  **PARTIAL in Session 7f** — /api/scan/parlay migrated to engine1.
+  /api/analyze/{prop,batch} stayed on legacy after Escape Hatch
+  (integration test asserts specific legacy-engine grade values).
+  /api/bets/* doesn't touch the legacy path at all (verified by grep).
+  Dead-code removal blocked because /api/analyze still imports
+  analyzeProp.
+
+  Adapter, computeFeaturesForProp, and analyzeViaEngine1 helpers all
+  shipped and tested. Future migration can flip the analyze route any
+  time the integration test mocks are updated to drive the new
+  upstream chain.
+
+  ORIGINAL Session 7e ARCH-1 narrative below for history.
+
+  **PARTIAL (carried from 7e)** — Step 1 of the migration (the adapter)
+  is complete and tested. Steps 2-6 partially executed.
     Step 1 ✓ — `src/utils/gradeAdapter.js` translates engine1 output
                   into the legacy shape `DemoScan` reads. 26 unit
                   tests covering grade collapse, confidence math,