optimize: Stage 5 synthesis prompt — round 0 winner (0.95→1.0 composite)

Applied first optimization result: tighter voice preservation instructions,
improved section flow guidance, trimmed redundant metadata instructions.
13382→11123 chars (-17%).

.gsd/STATE.md

@@ -0,0 +1,30 @@
+# GSD State
+
+**Active Milestone:** M013: M013:
+**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:
+
+## Recent Decisions
+- None recorded
+
+## Blockers
+- None
+
+## Next Action
+All milestones complete.