Dead code: LLMClient.send_stream() never called

[AshayK003]

Problem

LLMClient.send_stream() (line 105 of llm_client.py) is a generator-based streaming method that's never invoked.

Solution

Remove the method, or mark it as public API for future use.

Acceptance Criteria

• Codebase compiles without send_stream
• No tests break

Difficulty: Easy