📦 deps(thirdparty): update snapshots

brooks-lint/docs/antigravity-setup.md

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+# Antigravity Setup
+
+Google's [Antigravity](https://antigravity.google) uses Claude-compatible
+[Agent Skills](https://agentskills.io) and reads `AGENTS.md` / `GEMINI.md`, so all six brooks-lint
+modes run with no conversion.
+
+## Install
+
+```bash
+# project-scoped is the official convention (recommended)
+./scripts/install.sh antigravity --project   # this repo: ./.agent/skills
+
+# global
+curl -fsSL https://raw.githubusercontent.com/hyhmrright/brooks-lint/main/scripts/install.sh | bash -s -- antigravity
+./scripts/install.sh antigravity             # global: ~/.gemini/skills
+```
+
+Manual equivalent (project):
+
+```bash
+git clone https://github.com/hyhmrright/brooks-lint.git /tmp/brooks-lint
+mkdir -p .agent/skills
+cp -r /tmp/brooks-lint/skills/* .agent/skills/   # flat — brooks-* and _shared/ as siblings
+```
+
+## Invoke
+
+Ask naturally ("review this PR", "audit the architecture") — the agent selects the matching skill from
+its `description`. `AGENTS.md` / `GEMINI.md` carry the Iron Law and Health Score rules.
+
+## Notes
+
+- **Flat layout** is mandatory (the installer guarantees it): `../_shared/` only resolves when
+  `_shared/` is a sibling of the `brooks-*` folders.
+- The project convention `.agent/skills/` is well documented; the **global** skills path
+  (`~/.gemini/skills` vs a product subfolder) varies between sources — if the global install isn't
+  discovered, use the project install. Please report what worked.
+- 🧪 Documented per the official [skills](https://antigravity.google/docs/skills) and
+  [rules & workflows](https://antigravity.google/docs/rules-workflows) docs; community end-to-end
+  verification welcome — [open an issue](https://github.com/hyhmrright/brooks-lint/issues/new).