feat(source2): lock dark mode, sans-serif typography, and all recent updates

docs/vibe-coding/cursor-composer.md

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+# Cursor Composer
+
+Cursor does not read `AGENTS.md` natively — it uses its own rules format. Point
+Composer at this kit's rules with a small pointer rule rather than duplicating
+content:
+
+1. Create `.cursor/rules/agents.mdc` (the current, non-deprecated format — the old
+   single `.cursorrules` file still works but is legacy) with:
+   ```
+   ---
+   alwaysApply: true
+   ---
+   Read and follow AGENTS.md and SKILLS.md at the project root before doing any work.
+   ```
+2. Keep the actual rules in `AGENTS.md`/`SKILLS.md` as the source of truth — the
+   `.mdc` file is just a pointer, so Cursor and Claude Code/other tools never drift
+   out of sync.
+3. For rules that should only apply to certain paths (e.g. only `src/api/**`), add
+   additional scoped `.mdc` files under `.cursor/rules/` with a `globs:` frontmatter
+   key — that's Cursor-specific and doesn't belong in the cross-tool `AGENTS.md`.