chore: remove 2,367 lines of dead code — orphaned CSS, unused imports, stale files

Deleted files:
- generate_stage5_variants.py (874 lines) — superseded by pipeline.quality toolkit
- PROJECT_CONTEXT.md (461 lines) — stale, .gsd/PROJECT.md is the living doc
- CHRYSOPEDIA-ASSESSMENT.md (654 lines) — M011 triage artifact, all findings actioned

CSS cleanup (364 lines):
- 20 orphaned block groups from deleted review queue/old components
- Duplicate .btn base rule, .btn--warning, @keyframes stagePulse

Python imports:
- routers/pipeline.py: uuid, literal_column, over, text
- tests/test_pipeline.py: 9 unused imports (PropertyMock, create_engine, etc.)

Build verified: tsc --noEmit clean, npm run build clean (59 modules, 0 warnings).

.gsd/STATE.md

@@ -0,0 +1,34 @@
+# GSD State
+
+**Active Milestone:** M017: M017:
+**Active Slice:** None
+**Phase:** complete
+**Requirements Status:** 0 active · 0 validated · 0 deferred · 0 out of scope
+
+## Milestone Registry
+- ✅ **M001:** Chrysopedia Foundation - Infrastructure, Pipeline Core, and Skeleton UI
+- ✅ **M002:** M002:
+- ✅ **M003:** M003:
+- ✅ **M004:** M004:
+- ✅ **M005:** M005:
+- ✅ **M006:** M006:
+- ✅ **M007:** M007:
+- ✅ **M008:** M008:
+- ✅ **M009:** Homepage & First Impression
+- ✅ **M010:** Discovery, Navigation & Visual Identity
+- ✅ **M011:** M011:
+- ✅ **M012:** M012:
+- ✅ **M013:** M013:
+- ✅ **M014:** M014:
+- ✅ **M015:** M015:
+- ✅ **M016:** M016:
+- ✅ **M017:** M017:
+
+## Recent Decisions
+- None recorded
+
+## Blockers
+- None
+
+## Next Action
+All milestones complete.