Fix worker workflow: submit_review transition missed due to

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Fix worker workflow: submit_review transition missed due to context overflow

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Description

## Problem
Workers compact their context to stay within token limits, which **causes them to forget the initial system prompt instructions**. This includes the instruction to `transition_ticket(event: "submit_review")` after creating a PR.

## Two Scenarios

**Scenario 1: New Work**
- Worker creates new PR
- Needs to: update ticket URL, submit for review, mark idle

**Scenario 2: Fix After Review**
- PR already exists on ticket
- Worker makes fixes, pushes to same branch
- Needs to: just submit for review (PR URL unchanged)

## Solution: MCP Tool `submit_for_review(ticket_id)`
Create a single tool that handles both cases:

```ruby
# app/controllers/api/v1/mcp_controller.rb
def handle_submit_for_review(ticket_id)
  ticket = Ticket.find(ticket_id)
  
  # If ticket has no PR URL, prompt worker to create PR first
  unless ticket.pull_request_url.present?
    return { error: "Ticket has no PR URL. Create PR first with gh pr create" }
  end
  
  # Submit for review
  ticket.transition_to!(:pending_audit)
  
  # Mark agent idle
  current_agent.update!(availability_status: :idle)
  
  { success: true, message: "Ticket #${ticket_id} submitted for review" }
end
```

**Worker workflow:**
- After creating NEW PR: call `submit_for_review(ticket_id)`
- After fixing review feedback: call `submit_for_review(ticket_id)`

**Why this works:**
- MCP tools are **always visible** in tool list (not lost during compaction)
- Tool name tells them exactly what to do
- Single tool call works for both scenarios
- Fails fast if no PR exists (reminds them)

## Acceptance Criteria
- MCP tool `submit_for_review(ticket_id)` created
- Tool registered in mcp-bridge/src/tools/index.ts
- Permissions added to mcp_permissions.yml for worker role
- Tool validates PR URL exists before submitting
- Workers use this tool after PR creation (new or fixes)