Feature Request: Allow customizing chat title generation rules via CLAUDE.md or settings

Feature Request

Currently, Claude Code automatically generates and updates chat titles based on conversation content. The title sometimes changes mid-conversation as the topic shifts, which can be disorienting.

Proposed Behavior

Allow users to define rules for chat title generation in CLAUDE.md or project settings (e.g., settings.json). For example:

# CLAUDE.md
## Chat Title Rules
- Use the first user message as the title
- Keep titles under 30 characters
- Format: [Project] Topic

Why This Matters

• Users who manage multiple projects in one workspace benefit from consistent, predictable title formats
• Teams using shared CLAUDE.md configs could enforce naming conventions across sessions
• Prevents unexpected title changes mid-conversation

Current Behavior

Chat titles are auto-generated and may change as conversation evolves, with no way to customize the logic.