chore: expose SGS hall POI diagnostics

.superpowers/sdd/task-3-report.md

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+# Task 3 Report
+
+Status: DONE
+
+Files changed:
+- `src/repositories/GuideModelRepository.ts`
+
+Commands run:
+- `node scripts/check-sgs-hall-poi-adapter.mjs`
+  - Output: `SGS hall POI adapter smoke check passed`
+- `pnpm type-check`
+  - Output summary: `vue-tsc --noEmit` completed successfully in the main workspace.
+
+Commits created:
+- Main workspace commit will be created by controller after validation.
+
+Self-review notes:
+- Added dev-only SGS guide model diagnostics helper.
+- Replaced silent floor endpoint catches with guarded diagnostics while preserving empty-array fallback behavior.
+- Added hall-generation diagnostics for eligible spaces producing no renderable hall POIs and render filtering removing all hall POIs.
+- No page/component SGS payload parsing was added.
+
+Concerns:
+- None after main workspace validation.