Remove agent assignments - use status-only queue workflow

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Description

**Architecture Change: Remove Agent Assignments, Use Status-Only Workflow**

**Current Problem:**
The system has redundant concepts:
1. **Ticket assignments** - tickets assigned to specific agents
2. **Ticket statuses** - backlog, todo, in_progress, pending_audit, etc.

When an agent picks up a ticket, both happen:
- Ticket gets `assigned_agent_id` set
- Ticket status changes to `in_progress`

This is duplication. The status already indicates who's working on it (or that it's ready to be worked on).

**Proposed Design:**
Remove agent assignments entirely. The system becomes a **status-based queue**:

```
backlog → todo → in_progress → pending_audit → pending_approval → done
                ↑           ↑
           Any worker    Current worker
           can claim     is "owner" by virtue
                         of having it in_progress
```

**Workflow:**
1. Tickets in `todo` status are available for ANY worker to claim
2. Worker transitions ticket from `todo` → `in_progress` (self-assigns by claiming)
3. Other workers see ticket is `in_progress` and know it's taken
4. Worker transitions from `in_progress` → `pending_audit` when done
5. Reviewer sees ticket in `pending_audit` and can review it

**Benefits:**
- Simpler data model (no assigned_agent_id)
- True queue-based work distribution
- Any available worker can pick up work
- No bottlenecks from specific assignments
- More flexible team workflow

**Changes Required:**
1. Database: Remove `assigned_agent_id` column from tickets table
2. Models: Remove `belongs_to :assigned_agent` from Ticket
3. API/Tools: Remove `assign_ticket` MCP tool
4. UI: Remove assignment dropdowns/filters
5. Worker workflow: Claim mechanism based on status transition
6. Orchestrator: Match tickets to workers based on status, not assignment

**Migration Path:**
1. Set all `in_progress` tickets with assignments to `todo` (unassign)
2. Remove the column
3. Update all workflows to use status-only logic