docs: sync all documentation to current state (2026-04-28)

HELP.md:
- Replace stale "Agent Mode" section with accurate "Tools (⚡)" section
  including full tool table (27 tools across 9 categories)
- Fix header controls table: distinguish Context & Memory panel (sliders)
  from Settings dropdown (☰)
- Update Settings panel section: "Backend" → "Role", add S/M/L and ⌃↵
  to Display controls list
- Update Backends section to match Role toggle terminology

TODO__Agents.md:
- Mark 5 new journal tools as complete (ae_journal_list, entry_update,
  entry_disable, entry_append, entry_prepend)
- Add completed sections for: shell_exec tool, Tools toggle decoupling,
  UI input area polish (2026-04-28)

MASTER.md:
- Date: 2026-04-27 → 2026-04-28
- Orchestrator row: "Agent mode in UI" → "⚡ Tools toggle in UI (27 tools)"

CLAUDE.md:
- Date: 2026-04-03 → 2026-04-28
- Add orchestrator row to Current State table
- Add full 27-tool list for quick reference

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

documentation/MASTER.md

@@ -1,7 +1,7 @@
 # Cortex / Inara — Master Index
 
 > Start here. This document is a map, not a manual.
-> Last updated: 2026-04-27
+> Last updated: 2026-04-28
 
 ---
 
@@ -23,7 +23,7 @@ Cortex is a self-hosted personal AI platform. It routes messages from any input
 | Claude backend | ✅ Live | Primary — via Claude Code CLI |
 | Gemini backend | ✅ Live | Fallback — via Gemini CLI |
 | Local backend | ✅ Live | Third option — Open WebUI/Ollama on scott_gaming |
-| Gemini orchestrator | ✅ Live | Tool loop → Claude response, Agent mode in UI |
+| Gemini orchestrator | ✅ Live | Tool loop → Claude response, ⚡ Tools toggle in UI (27 tools) |
 | Model registry V2 | ✅ Live | Providers (Anthropic/Google/Local), multi-account Gemini |
 | Memory distillation | ✅ Live | Short (daily) / Mid (weekly) / Long (monthly) |
 | Multi-user | ✅ Live | Scott, Holly, Brian — each with own personas |