refactor: split tool declarations into domain files + role config UI

tools/__init__.py shrinks from 1,137 → 250 lines. Each domain file now
owns both its callables and its FunctionDeclarations (DECLARATIONS list),
so adding a new tool only touches one file.

New TOOL_CATEGORIES dict exported from __init__ — used by the UI for
grouped tool checkboxes.

Role config UI (Settings → Model Registry → Role Assignments):
- ⚙ button per role expands an inline configure panel
- Textarea for system_append (injected into system prompt for this role)
- Grouped checkboxes for tool allow-list (all checked = no restriction)
- POST /api/models/role-config saves both fields; updates ROLE_CONFIG_DATA
  in-page so re-open reflects current state without a page reload

Backend:
- model_registry.set_role_config() writes system_append + tools to registry
- TOOL_CATEGORIES exported from tools/__init__ for UI rendering
- TOOLS.md header updated: 30 → 39 tools (ae_journal_* and cortex_* additions)

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

cortex/tools/cron.py

@@ -17,6 +17,7 @@ import secrets
 from datetime import datetime, timezone
 from pathlib import Path
 
+from google.genai import types
 from persona import persona_path, get_user, get_persona
 from cron_runner import load_crons, save_crons, parse_schedule
 
@@ -194,3 +195,64 @@ async def cron_toggle(cron_id: str) -> str:
 
 async def reminders_clear() -> str:
     return await asyncio.to_thread(_reminders_clear)
+
+
+DECLARATIONS = [
+    types.FunctionDeclaration(
+        name="cron_list",
+        description=(
+            "List all scheduled cron jobs — their ID, label, schedule, type, and last run time. "
+            "Use this to see what's scheduled before adding or removing jobs."
+        ),
+        parameters=types.Schema(type=types.Type.OBJECT, properties={}),
+    ),
+    types.FunctionDeclaration(
+        name="cron_add",
+        description=(
+            "Create a new scheduled cron job and register it immediately (no restart needed). "
+            "Two types: 'remind' writes to the pending reminders queue (Inara sees it automatically "
+            "in context next session); 'note' appends to the scratchpad. "
+            "Schedule formats: 'hourly' | 'daily' | 'daily:HH:MM' | 'weekly:DOW' | 'weekly:DOW:HH:MM'. "
+            "Example: schedule='daily:09:00', type='remind', payload='Check in with Scott.'"
+        ),
+        parameters=types.Schema(
+            type=types.Type.OBJECT,
+            properties={
+                "label": types.Schema(type=types.Type.STRING, description="Short human-readable name for this job (e.g. 'Morning check-in')"),
+                "schedule": types.Schema(type=types.Type.STRING, description="When to run. Formats: hourly | daily | daily:HH:MM | weekly:DOW | weekly:DOW:HH:MM  (e.g. 'weekly:mon:09:00')"),
+                "job_type": types.Schema(type=types.Type.STRING, description="'remind' (→ REMINDERS.md, auto-surfaced in context) or 'note' (→ SCRATCH.md)"),
+                "payload": types.Schema(type=types.Type.STRING, description="The text to write when the job fires"),
+            },
+            required=["label", "schedule", "job_type", "payload"],
+        ),
+    ),
+    types.FunctionDeclaration(
+        name="cron_remove",
+        description=(
+            "Permanently delete a scheduled cron job. Use cron_list first to get the ID. "
+            "To temporarily disable without deleting, use cron_toggle instead."
+        ),
+        parameters=types.Schema(
+            type=types.Type.OBJECT,
+            properties={
+                "cron_id": types.Schema(type=types.Type.STRING, description="Job ID (e.g. c_abc123) — get from cron_list"),
+            },
+            required=["cron_id"],
+        ),
+    ),
+    types.FunctionDeclaration(
+        name="cron_toggle",
+        description=(
+            "Pause a running cron job, or resume a paused one. "
+            "The job stays in the list and can be re-enabled later. "
+            "Use cron_list to see current enabled/paused state."
+        ),
+        parameters=types.Schema(
+            type=types.Type.OBJECT,
+            properties={
+                "cron_id": types.Schema(type=types.Type.STRING, description="Job ID (e.g. c_abc123) — get from cron_list"),
+            },
+            required=["cron_id"],
+        ),
+    ),
+]