fix: keep SGS hall fallback metadata preview-only

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.superpowers/sdd/task-2-report.md

@@ -1,10 +1,10 @@
 # Task 2 Report
 
-Status: DONE_WITH_CONCERNS
+Status: DONE
 
 Files changed:
 - `src/data/adapters/sgsSdkGuideAdapter.ts`
-- `src/domain/museum.ts`
+- `.superpowers/sdd/task-2-report.md`
 
 Commands run:
 - `node scripts/check-sgs-hall-poi-adapter.mjs`
@@ -12,16 +12,12 @@ Commands run:
 - `pnpm type-check`
   - Output summary: `vue-tsc --noEmit` completed successfully.
 
-Commits created:
-- `08a6bcb` in implementer worktree: `feat: expand SGS hall POI adaptation`
-- Main workspace integrated manually because cherry-pick was blocked by existing local changes to the same files.
+Commit:
+- Pending in current worktree at report update time.
 
-Self-review notes:
-- Adapter now includes public exhibition-space whitelist and keyword checks.
-- `toMuseumHallPoisFromSgs` now supports entrance anchors, space-center fallback, standalone space fallback, and diagnostics helper.
-- Main integration preserves stronger Task 1 semantics approved by user: `backend-sgs-sdk-hall-entrance` requires both entrance coordinates and route node, and later real entrance anchors can upgrade a space-center POI.
-- `src/domain/museum.ts` already had/keeps typed hall fields (`MuseumPoiKind`, `MuseumPoiEntrance`, hall/source fields, preview fields) required by adapter output.
+Notes:
+- POI-level `sourcePlaceId` now remains unset for space-center fallback halls; entrance-specific `sourcePlaceId`/`routeNodeId` stay on `entrances` until a route-capable entrance upgrades the POI.
+- Space-center fallback halls now use matched-space floor metadata; route-capable entrance upgrades replace POI floor metadata with entrance floor metadata and set `sourceConfidence` to `backend-sgs-sdk-hall-entrance`.
 
 Concerns:
-- Manual integration was required because the main workspace already had overlapping uncommitted changes in adapter/domain files.
-- Task 3 will add repository diagnostics consumption of `createSgsHallPoiDiagnostics`.
+- The targeted smoke script is a lightweight regression harness, not a full test runner.