docs: comprehensive doc audit — sync all docs to current state

- MASTER.md: tool count 40→47, add proactive notifications + spawn_agent rows, date bump
- ROADMAP.md: mark local orchestrator/web push/proactive notifs/spawn_agent/web_read/session_read as done, date bump
- ARCH__CHANNELS.md: rewrite notification channel config section — all 4 channels, all triggers, on-demand endpoints
- ARCH__SYSTEM.md: update tools/ module list to include files, agents
- README.md: update LLM backends in architecture diagram, add browser push to channels table
- CLAUDE.md: add doc update checklist to Documentation Philosophy section

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

documentation/ROADMAP.md

@@ -1,7 +1,7 @@
 # Cortex — Roadmap
 
 > Phases and priorities. For active tasks see `TODO__Agents.md`.
-> Last updated: 2026-04-29
+> Last updated: 2026-05-09
 
 ---
 
@@ -39,7 +39,12 @@
 - ✅ Session search (full-text across past session logs)
 - ✅ Distill notifications (NC Talk after mid/long runs)
 - ✅ Local backend for distillation (DISTILL_BACKEND_MID/LONG in .env)
-- [ ] **Local orchestrator** — ReAct tool loop using local model (High priority — see `TODO__Agents.md`)
+- ✅ Local orchestrator — OpenAI-compatible ReAct loop; fires when orchestrator role → local model
+- ✅ Web push notifications — VAPID; `web_push` tool; PWA-installable; subscribe via ☰ menu
+- ✅ Proactive notifications — daily reminder check (09:00); `notify()` routes to any configured channel; dedicated settings page
+- ✅ Sub-agent spawning — `spawn_agent` tool; per-host concurrency limit; Gemini API + local OpenAI backends
+- ✅ Web content extraction — `web_read` via trafilatura; strips ads/nav/boilerplate; 128K cap
+- ✅ Session log reader — `session_read(date)` tool; complements `session_search`
 - [ ] Knowledge import — markdown → AE Journals (import script)
 - [ ] Dev agent pipeline — specialist agents + supervisor + approval gate
 - [ ] Gitea webhook integration + Actions CI