feat: split help into tabbed UI Guide / Tools / Persona pages

- cortex/static/TOOLS.md — tool reference extracted from HELP.md; uses ##
  headers so each category is collapsible. All 30 tools with descriptions.
- cortex/static/HELP.md — UI guide only; tools section replaced with a
  one-line pointer to the Tools tab.
- help.html — three tabs (UI Guide / Tools / Persona); tab choice persists
  in localStorage. Tools tab defaults all sections open. Persona tab shows
  home/{user}/persona/{name}/HELP.md with an empty-state message if unset.
- context_loader.py — loads cortex/static/TOOLS.md into context at tier 2+
  (replaces the previously empty persona HELP.md load). Persona HELP.md
  still loaded if non-empty, as persona-specific additions.

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

cortex/context_loader.py

@@ -1,5 +1,9 @@
+from pathlib import Path
+
 from persona import persona_path
 
+_STATIC_DIR = Path(__file__).parent / "static"
+
 
 # Core identity files — always loaded regardless of tier
 _CORE = ["SOUL.md", "IDENTITY.md"]
@@ -52,8 +56,14 @@ def load_context(
     if proto_path.exists():
         parts.append(f"--- PROTOCOLS.md ---\n{proto_path.read_text()}")
 
+    # Global tool reference (same for all personas)
+    tools_path = _STATIC_DIR / "TOOLS.md"
+    if tools_path.exists():
+        parts.append(f"--- TOOLS.md ---\n{tools_path.read_text()}")
+
+    # Persona-specific help additions (optional)
     help_path = inara_dir / "HELP.md"
-    if help_path.exists():
+    if help_path.exists() and help_path.stat().st_size > 10:
         parts.append(f"--- HELP.md ---\n{help_path.read_text()}")
 
     # ── 4. Pending reminders (tier 2+) ────────────────────────────