fix: Add 'pending' status to task status enum

Resolves MCP error when trying to set status="pending" on tasks.

Changes:
- Migration 019: Add 'pending' to tasks.status CHECK constraint
- Update task_update tool schema to accept 'pending' status
- Update task_list tool schema to filter by 'pending' status

Status meanings:
- pending: Created, awaiting approval or dependencies
- open: Approved and ready to start
- in_progress: Currently being worked on
- testing: Implementation complete, being tested
- blocked: Stuck waiting for something
- completed: Done

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/tools/index.ts

@@ -24,7 +24,7 @@ export const toolDefinitions = [
       type: 'object',
       properties: {
         project: { type: 'string', description: 'Filter by project key' },
-        status: { type: 'string', enum: ['open', 'in_progress', 'testing', 'blocked', 'completed'], description: 'Filter by status' },
+        status: { type: 'string', enum: ['pending', 'open', 'in_progress', 'testing', 'blocked', 'completed'], description: 'Filter by status' },
         type: { type: 'string', enum: ['task', 'bug', 'feature', 'debt', 'investigation'], description: 'Filter by type' },
         priority: { type: 'string', enum: ['P0', 'P1', 'P2', 'P3'], description: 'Filter by priority' },
         limit: { type: 'number', description: 'Max results (default: 20)' },
@@ -60,7 +60,7 @@ export const toolDefinitions = [
       type: 'object',
       properties: {
         id: { type: 'string', description: 'Task ID to update' },
-        status: { type: 'string', enum: ['open', 'in_progress', 'testing', 'blocked', 'completed'], description: 'New status' },
+        status: { type: 'string', enum: ['pending', 'open', 'in_progress', 'testing', 'blocked', 'completed'], description: 'New status' },
         priority: { type: 'string', enum: ['P0', 'P1', 'P2', 'P3'], description: 'New priority' },
         type: { type: 'string', enum: ['task', 'bug', 'feature', 'debt', 'investigation'], description: 'New type' },
         title: { type: 'string', description: 'New title' },