L0–L7 folders stack on scroll with aligned max depth, labeled tabs that
stay consistent when L7 joins the rail, Cal embeds, preview screenshots,
Playwright tests, and updated README.
Co-authored-by: Cursor <cursoragent@cursor.com>
All folders stick at --stack-reveal; higher layers paint over lower ones.
Bodies hidden until panel aligns on the stack line (no vertical list).
Co-authored-by: Cursor <cursoragent@cursor.com>
Tested all four variants in browser — only active layer body visible while
tabs stay staggered; scroll covers previous layers correctly.
Co-authored-by: Cursor <cursoragent@cursor.com>
