Session auto-titler uses raw XML markup and overrides /rename

Bug Description

Session auto-naming displays raw internal XML markup instead of generating human-readable titles. Sessions show names like:

<command-name>/clear</command-name> <command-message>clear</comman...
<command-name>/rename</command-name> <command-message>rename</comm...

Steps to Reproduce

1. Start a new Claude Code session
2. Use a slash command as the first interaction (e.g., /clear or /rename)
3. Check the session list with claude --resume
4. Session name shows raw XML tags instead of a clean title

Additional Issue

When manually renaming with /rename <name>, the auto-titler overrides the custom name and reverts it back to the raw XML markup. There is no config setting to disable auto session title generation.

Expected Behavior

1. Session auto-titler should strip/parse internal XML tags before generating names
2. Manual /rename should persist and not be overwritten by auto-titler
3. Ideally, a config option to disable auto session title generation

Environment

• macOS (Darwin 25.2.0)
• Claude Code latest
• Running 18+ concurrent sessions with CLAUDE_CODE_DISABLE_TERMINAL_TITLE=1

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