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/tasks.py

@@ -20,6 +20,7 @@ import asyncio
 from datetime import datetime, timezone
 from pathlib import Path
 
+from google.genai import types
 from persona import persona_path
 
 
@@ -133,3 +134,70 @@ async def task_update(task_id: str, status: str | None = None, title: str | None
 
 async def task_complete(task_id: str) -> str:
     return await asyncio.to_thread(_task_complete, task_id)
+
+
+DECLARATIONS = [
+    types.FunctionDeclaration(
+        name="task_list",
+        description=(
+            "List personal tasks from Inara's task list. "
+            "Use this to check what's on the list, review pending work, or find a task ID. "
+            "Optionally filter by status: 'todo', 'in_progress', or 'done'."
+        ),
+        parameters=types.Schema(
+            type=types.Type.OBJECT,
+            properties={
+                "status": types.Schema(type=types.Type.STRING, description="Filter by status: 'todo', 'in_progress', or 'done'. Omit to list all."),
+            },
+        ),
+    ),
+    types.FunctionDeclaration(
+        name="task_create",
+        description=(
+            "Add a new task to Inara's personal task list. "
+            "Use this when the user asks to remember something, add a to-do, or track a follow-up."
+        ),
+        parameters=types.Schema(
+            type=types.Type.OBJECT,
+            properties={
+                "title": types.Schema(type=types.Type.STRING, description="Short task title"),
+                "description": types.Schema(type=types.Type.STRING, description="Optional longer description or context"),
+                "priority": types.Schema(type=types.Type.STRING, description="Priority: 'low', 'normal', or 'high'. Default: normal."),
+            },
+            required=["title"],
+        ),
+    ),
+    types.FunctionDeclaration(
+        name="task_update",
+        description=(
+            "Update an existing task. Use task_list first to get the task ID. "
+            "Can update status, title, description, or priority. "
+            "To just mark complete, use task_complete instead."
+        ),
+        parameters=types.Schema(
+            type=types.Type.OBJECT,
+            properties={
+                "task_id": types.Schema(type=types.Type.STRING, description="Task ID (e.g. t_abc123) — get from task_list"),
+                "status": types.Schema(type=types.Type.STRING, description="New status: 'todo', 'in_progress', or 'done'"),
+                "title": types.Schema(type=types.Type.STRING, description="Updated title"),
+                "description": types.Schema(type=types.Type.STRING, description="Updated description"),
+                "priority": types.Schema(type=types.Type.STRING, description="Updated priority: 'low', 'normal', or 'high'"),
+            },
+            required=["task_id"],
+        ),
+    ),
+    types.FunctionDeclaration(
+        name="task_complete",
+        description=(
+            "Mark a task as done. Use task_list first to get the task ID. "
+            "Shorthand for task_update with status='done'."
+        ),
+        parameters=types.Schema(
+            type=types.Type.OBJECT,
+            properties={
+                "task_id": types.Schema(type=types.Type.STRING, description="Task ID (e.g. t_abc123) — get from task_list"),
+            },
+            required=["task_id"],
+        ),
+    ),
+]