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

docs/vibe-coding/antigravity-cli.md

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+# Antigravity CLI
+
+Antigravity (Google) reads a root-level `AGENTS.md` natively as its primary
+standing-instructions file — no changes needed, this kit's `AGENTS.md` is picked up
+as-is.
+
+- **Verify it's loaded**: run `agy inspect` in the project root; it lists loaded
+  config sources and should show `AGENTS.md`.
+- **Global rules** (apply to every project, not just this one) live in
+  `~/.gemini/GEMINI.md` — keep that file for personal cross-project preferences only;
+  project-specific rules belong in `AGENTS.md`.
+- **Workspace-only rules** (not meant to travel with the repo) can go in
+  `.agents/rules/` instead.
+- **Skills**: Antigravity supports directory-based Skills loaded only when relevant.
+  If you want the `SKILLS.md` roles enforced more strictly, mirror each role as a
+  `.agents/skills/<role>/SKILL.md` package; otherwise the plain `SKILLS.md` reference
+  from `AGENTS.md` §4 is sufficient.