feat(coord): add todos system with per-user/machine/project scoping

New coord_todos table and API endpoints (GET/POST/PUT/DELETE /api/coord/todos)
supporting manual and auto-created items, sub-tasks via parent_id, and inclusive
for_user/for_machine filters (OR-null) for sync/save display. sync.sh Phase 7
now shows pending todos grouped by project after every sync. CLAUDE.md documents
auto-creation behavior for unresolved follow-up. Web/email pricing doc updated:
block time rate clarified, INKY reference removed, dates updated.

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

api/schemas/coord_todo.py

@@ -0,0 +1,57 @@
+"""Pydantic schemas for CoordTodo."""
+
+from __future__ import annotations
+
+from datetime import datetime
+from typing import Optional
+from uuid import UUID
+
+from pydantic import BaseModel, Field
+
+
+class CoordTodoCreate(BaseModel):
+    """Input schema for creating a to-do item."""
+
+    text: str = Field(..., description="To-do item text")
+    project_key: Optional[str] = Field(None, description="Project scope; NULL = personal", max_length=100)
+    parent_id: Optional[UUID] = Field(None, description="Parent to-do ID for sub-tasks")
+    assigned_to_user: Optional[str] = Field(None, description="Target user, e.g. 'mike'", max_length=50)
+    assigned_to_machine: Optional[str] = Field(None, description="Target hostname", max_length=100)
+    auto_created: bool = Field(False, description="True when Claude auto-generated this item")
+    source_context: Optional[str] = Field(None, description="Why Claude auto-created this item")
+    created_by_user: str = Field(..., description="User creating the item", max_length=50)
+    created_by_machine: str = Field(..., description="Hostname where the item is created", max_length=100)
+
+
+class CoordTodoUpdate(BaseModel):
+    """Input schema for updating a to-do item."""
+
+    text: Optional[str] = None
+    status: Optional[str] = Field(None, description="pending / done / cancelled")
+    assigned_to_user: Optional[str] = Field(None, max_length=50)
+    assigned_to_machine: Optional[str] = Field(None, max_length=100)
+    project_key: Optional[str] = Field(None, max_length=100)
+    completed_by: Optional[str] = Field(None, description="Session or user completing the item", max_length=100)
+
+
+class CoordTodoResponse(BaseModel):
+    """Output schema for a to-do item."""
+
+    id: UUID
+    text: str
+    project_key: Optional[str]
+    parent_id: Optional[UUID]
+    assigned_to_user: Optional[str]
+    assigned_to_machine: Optional[str]
+    auto_created: bool
+    source_context: Optional[str]
+    status: str
+    completed_at: Optional[datetime]
+    completed_by: Optional[str]
+    created_by_user: str
+    created_by_machine: str
+    created_at: datetime
+    updated_at: datetime
+    subtasks: list[CoordTodoResponse] = Field(default_factory=list)
+
+    model_config = {"from_attributes": True}