feat: list Antigravity 0.1.0 - #7

Summary

Lists the Antigravity plugin: Gemini through a Google Antigravity sign-in, as a native plugin for macOS. Design and risks: Godwit ADR 0033.

 directory.json
+  antigravity  models · third-party · Godwit
+    source: godwit-email/plugin-antigravity @ 3e1d112 (godwit-plugin.json)
+    0.1.0, minGodwit 1.30.0 (the first with the login capability)
+    darwin-arm64, darwin-amd64 only

Review checklist

1. Source. Public repository; both libraries are built by its CI from tag v0.1.0 (run 42468575336).
2. Files. Downloaded from the release: the SHA-256 and sizes in godwit-plugin.json were computed from the files themselves, and match the release's SHA256SUMS.
3. Manifest. Same as the tagged plugin.json, and as describe answers: capabilities models, login.
4. Risk in plain words. The summary says Antigravity's terms forbid third-party access, that Google may suspend the user's access, and that mail goes to Google, which stores it and may have it reviewed. dataFlow is third-party.

Merge Danger

Door: two-way — remove the entry, or add revoked, to withdraw it from every install.

Blast Radius: users who install it. Being listed shows it as reviewed, while using it breaches Antigravity's terms. The maintainer chose this knowing it; the summary and the plugin's sign-in notice spell it out.

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