docs: add living status tracker (closes #64)

docs/STATUS_TRACKER.md

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+# TurboQuant Living Status Tracker
+
+Updated on each milestone. See PROJECT_STATUS.md for detailed phase reports.
+
+## Quick Status
+
+| Phase | Status | Last Updated | Issue |
+|-------|--------|-------------|-------|
+| Phase 1: PolarQuant MVP | DONE | 2026-03-30 | #17 |
+| Phase 2: KV Cache Compression | IN PROGRESS | 2026-04-15 | #99 |
+| Edge Crisis Detection | DONE | 2026-04-15 | #102 |
+| Integration PR (upstream llama.cpp) | NOT STARTED | — | — |
+| QJL Quantization | NOT STARTED | — | — |
+| Ollama Integration | NOT STARTED | — | — |
+| Benchmark Suite | IN PROGRESS | 2026-04-13 | #12 |
+
+## Phase Details
+
+### Phase 1: PolarQuant MVP — COMPLETE
+- PolarQuant KV cache compression working on Apple Silicon
+- 73% KV memory savings, 1% prompt overhead, 11% generation overhead
+- Metal shaders: flash attention, WHT rotation, codebooks
+- Hardware: M3 Max 36GB (corrected from spec)
+- Gate Check #2: PASSED
+
+### Phase 2: Edge Deployment — COMPLETE
+- Crisis detection on edge devices (Pi 4, old phones)
+- Keyword + model (gemma2:2b) + offline resources
+- Deployment guide, model selection, resource cache
+- See docs/edge-crisis-deployment.md
+
+### Phase 3: Upstream Integration — NOT STARTED
+- PR to llama.cpp for turbo quantization
+- Depends on Phase 2 benchmarks
+
+### Phase 4: QJL — NOT STARTED
+- Johnson-Lindenstrauss quantization
+- Lower memory than PolarQuant
+- Research phase
+
+## Recent Milestones
+
+| Date | Milestone | PR/Issue |
+|------|-----------|----------|
+| 2026-04-15 | Edge crisis detection deployed | #102 / PR #111 |
+| 2026-04-14 | KV cache compression profiles | PR #68 |
+| 2026-04-13 | Benchmark suite expanded | #12 / #39 |
+| 2026-03-30 | Phase 1 complete: PolarQuant MVP | #17 |
+
+## Open Blockers
+
+| Blocker | Impact | Issue |
+|---------|--------|-------|
+| None currently | — | — |
+
+---
+
+*Last auto-updated: 2026-04-15*
+*This file is the single source of truth for project status.*
+*Update it on every milestone merge.*