Add availability_updated_at to list_members MCP output

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Description

Add the `availability_updated_at` field to the `list_members` MCP tool output so agents can see when a member's availability status was last updated.

## Problem

The `list_members` tool currently returns member information but does not include `availability_updated_at`. This timestamp is important for:
- Determining if an agent's status is stale (e.g., marked busy but hasn't updated in hours)
- Orchestrator coordination logic (checking if agent has been idle for X minutes)
- Debugging availability state issues

## Changes Required

**File:** `app/controllers/api/v1/mcp_controller.rb`

In the `handle_list_members` method, add `availability_updated_at` to the serialized output:

```ruby
# Current output includes:
# id, name, agent_type, status, active, assigned_tickets_count

# Add:
availability_updated_at
```

**Format:** ISO 8601 datetime string

## Acceptance Criteria

- `list_members` output includes `availability_updated_at` for each member
- Field is formatted as ISO 8601 datetime string
- Field is nil for members without availability status (shouldn't happen with current schema but handle gracefully)
- TypeScript bridge output reflects the new field

## Files to Modify

- `app/controllers/api/v1/mcp_controller.rb` - add field to serializer
- `spec/requests/api/v1/mcp_spec.rb` - add test verifying field is present