refactor(scum): remove orphaned host panels

openspec/changes/move-scum-feature-ownership-to-plugin/implementation-blockers.md

@@ -41,3 +41,33 @@ Consequently these tasks remain open and blocked rather than simulated:
 
 No fallback to raw RCON, credentials, SQL, direct game-database access, OCR,
 screenshots, keyboard/mouse injection, or desktop automation is permitted.
+
+## 6.3 frontend cleanup and rollback evidence (2026-07-29)
+
+The generic `PluginPageHostPage` has no hard-coded SCUM import or `game.scum`
+branch. Static `rg` call-graph audit found zero non-test callers for the
+following former `platform_web` implementation, so this batch removed it with
+its private tests, contracts, schemas, API-client methods/types, and map-only
+styles:
+
+- `ScumOperationsPanel`, `ScumFileConfigWorkbench`, and the private
+  `scumOperations` contract/schema;
+- `GamePlayerIntelligencePanel` and `GameGiftCatalogPanel`;
+- `ScumMapTrajectoryPanel`.
+
+Their plugin-owned replacement is `features/page.ts`, with typed bridge reads
+and commands in `features/api.ts`, and the read-only provenance adapters in
+`features/migration.ts`. The replacement remains capability-gated: missing
+login/position event producers and missing state-patch/reward-delivery
+handlers render unavailable controls and never synthesize records or enable a
+fallback execution path.
+
+The platform-side `/game-players`, `/game-gifts`, and `/game-map-trajectories`
+routes, DTO/domain/model/service/repository implementations, and their
+fixtures remain intentionally. `plugins/tests/fixtures/scum-migration-parity.ts`
+continues to consume their historical record shapes through allowlisted,
+`transitional-read-only` migration records. Rollback therefore consists of
+disabling the exact server/version plugin authority flag, leaving those prior
+records visible and read-only; it does not restore any deleted host panel or
+re-enable an unsafe execution route. Backend removal remains blocked until 6.2
+parity and the required versioned event/operation protocols exist.