Add list_comments MCP tool for tickets

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Title *

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Description

Add MCP tool to list/read comments on tickets so agents can see clarifications, decisions, and updates.

## Problem

Currently, `get_ticket` returns `comments_count` but not the actual comment content. This means agents cannot see important information added as comments (decisions, clarifications, updated requirements).

## Required Implementation

**New MCP Tool:** `list_comments(ticket_id)`

Should return:
- Comment ID
- Content (markdown/text)
- Comment type (note, question, decision, code_review)
- Author (agent name or human)
- Created at timestamp
- Updated at timestamp (if edited)

**Location:** 
- MCP bridge Go code (likely in agent-bridge.go or similar)
- Rails controller action to fetch comments

**API Endpoint:**
```
GET /api/v1/tickets/:ticket_id/comments
```

## Acceptance Criteria

- [ ] `list_comments` tool added to MCP bridge
- [ ] Tool can be called with ticket_id
- [ ] Returns array of comments with full content
- [ ] Comments include metadata (author, type, timestamps)
- [ ] Tool is accessible to all agent types (worker, reviewer, researcher)
- [ ] Comments are ordered by created_at (newest first typical)

## Example Response

```json
{
  "ticket_id": 134,
  "comments": [
    {
      "id": 138,
      "content": "Updated requirements with cleaner plan...",
      "comment_type": "decision",
      "author": "planner",
      "created_at": "2025-12-30T...",
      "updated_at": null
    }
  ]
}
```