Feature request: allow renaming/labeling conversations

Summary

There's no way to rename or label a Claude Code conversation. Sessions are identified only by internal IDs, which makes it difficult to find and return to specific conversations — especially when running multiple concurrent terminals on different workstreams.

Use case

• Running parallel terminals on different tasks (e.g., one for frontend work, one for infra)
• Returning to a prior session days later and needing to identify it by topic
• General session management when conversation count grows

Proposed behavior

Allow users to assign a human-readable name/label to a conversation, e.g.:

/rename "Fortify auth middleware refactor"

The name would appear in /conversations output and any session-listing UI (VS Code sidebar, web app, etc.).

Alternatives considered

• Manual tracking via external notes or scratchpad files — works but adds friction
• Session journals — useful for context reconstruction but doesn't solve the discoverability problem in the conversation list itself