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Hovering a file in the left pane now shows its `# Slug:` line as a tooltip — a one-line synopsis per chapter. Slugs are cached per file (name -> slug), filled when the workspace opens (snapshot_slugs) and refreshed on save; the selected file is parsed live from the buffer so unsaved slug edits show immediately. The cache is kept consistent on rename and delete. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N9kRuP7JvXoUGdNNeg5ZSs