Support conversation continuity with Claude

[gsiener]

Problem

Currently each review is stateless. If you reply to Claude's suggestion with "can you elaborate?", Claude doesn't remember the context.

Proposed Solution

When Claude responds to a comment, track the conversation thread. When a human replies, the next review should include that conversation context.

Technical Approach

• Store conversation history per document/thread
• Include previous exchanges in Claude's prompt
• May need a database for persistence

Acceptance Criteria

• Claude remembers previous suggestions it made
• Claude can continue conversations in comment threads
• Context persists across CLI invocations