Add assign_ticket and list_agents MCP tools

Tinker

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Description

**Objective:** Add member assignment and discovery to MCP interface (supports agents + humans).

**Tools to Add:**

1. **`list_members`** - Get team members
   - Returns: id, name, role (worker/reviewer/orchestrator/user), active, assigned_count
   - Filters: role, active (true/false)
   - Use case: Orchestrator finds available workers

2. **`assign_ticket`** - Assign ticket + optional state transition (2-in-1)
   - Parameters:
     - `ticket_id` (required)
     - `member_id` (optional) → if null, assigns to current_agent
     - `status` (optional) → if provided, also transitions ticket to this state
   - Examples:
     - Worker: `assign_ticket(ticket_id, status: "in_progress")` → self-assign + start
     - Orchestrator: `assign_ticket(ticket_id, member_id: X, status: "todo")` → assign + queue
   - Only works on claimable statuses: backlog, todo
   - Validates member exists and is active
   - Returns: updated ticket with new assignee and status

**Acceptance Criteria:**
- `list_members` returns unified agent+user list with role field
- `assign_ticket` defaults to current_agent when member_id omitted
- `assign_ticket` performs both assignment and transition when status provided
- Assignment is logged/audited
- Follows existing MCP patterns

**Files to Modify:**
- `app/controllers/api/v1/mcp_controller.rb`