feat: DebugPayloadViewer component with copy, export, collapsible sections

.gsd/PROJECT.md

@@ -20,6 +20,7 @@ Five milestones complete plus a sixth refinement milestone. The system is deploy
 - **Key moment card redesign** — Cards in sidebar show title prominently on its own line (h3), with source file, timestamp, and content type badge on a clean metadata row below.
 - **Admin navigation dropdown** — Header consolidated: Home, Topics, Creators visible; Admin dropdown reveals Review, Reports, Pipeline. ModeToggle removed from header.
 - **Pipeline head/tail log view** — Pipeline event log shows Head/Tail toggle with configurable event count. Token counts visible per event and per video.
+- **Pipeline debug mode** — Redis-backed toggle captures full LLM system prompt, user prompt, and response text in pipeline_events. Per-stage token summary endpoint for cost/usage analysis.
 - **Git commit SHA tracking** — Pipeline captures current git commit SHA. Technique page versions display commit hash in metadata.
 - **Technique page tag polish** — Sidebar reordered (Plugins Referenced at top), creator name prominent, tags use coherent color system.
 - **Topics page redesign** — 7 categories (including Music Theory) with card layout, descriptions, sub-topic counts, colored left borders.

.gsd/STATE.md

@@ -0,0 +1,24 @@
+# GSD State
+
+**Active Milestone:** M007: M007
+**Active Slice:** S02: Debug Payload Viewer — Inline View, Copy, and Export in Admin UI
+**Phase:** evaluating-gates
+**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: Chrysopedia Deployment — GitHub, ub01 Docker Stack, and Production Wiring
+- ✅ **M003:** M003: Domain + DNS + Per-Stage LLM Model Routing
+- ✅ **M004:** M004: UI Polish, Bug Fixes, Technique Page Redesign, and Article Versioning
+- ✅ **M005:** M005: Pipeline Dashboard, Technique Page Redesign, Key Moment Cards
+- ✅ **M006:** M006: Admin Nav, Pipeline Log Views, Commit SHA, Tag Polish, Topics Redesign, Footer
+- 🔄 **M007:** M007
+
+## Recent Decisions
+- None recorded
+
+## Blockers
+- None
+
+## Next Action
+Evaluate 3 quality gate(s) for S02 before execution.