fix: LLM config, task time limits, base_url, fallback model, debug Redis caching

- Add BASE_URL setting to config.py, replace hardcoded localhost:8096 in notifications
- Fix LLM_FALLBACK_MODEL default from fyn-llm-agent-chat to qwen2.5:7b
- Fix docker-compose LLM_FALLBACK_MODEL to use env var with correct default
- Add BASE_URL env var to API and worker in docker-compose.yml
- Add soft_time_limit/time_limit to all pipeline stage tasks (prevent stuck workers)
- Cache Redis connection in _is_debug_mode() instead of creating per-call
- Remove duplicate test files in backend/tests/notifications/

.gsd/STATE.md

@@ -0,0 +1,42 @@
+# GSD State
+
+**Active Milestone:** M025: Hardening & Launch Prep
+**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:
+- ✅ **M018:** M018:
+- ✅ **M019:** Foundations — Auth, Consent & LightRAG
+- ✅ **M020:** Core Experiences — Player, Impersonation & Knowledge Routing
+- ✅ **M021:** Intelligence Online — Chat, Chapters & Search Cutover
+- ✅ **M022:** Creator Tools & Personality
+- ✅ **M023:** MVP Integration — Demo Build
+- ✅ **M024:** Polish, Shorts Pipeline & Citations
+- ✅ **M025:** Hardening & Launch Prep
+
+## Recent Decisions
+- None recorded
+
+## Blockers
+- None
+
+## Next Action
+All milestones complete.