feat(antigravity-auth): add request/response transformation with tools and thinking

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src/auth/antigravity/index.ts

@@ -5,3 +5,8 @@ export * from "./constants"
 export * from "./oauth"
 export * from "./token"
 export * from "./project"
+export * from "./request"
+export * from "./response"
+export * from "./tools"
+export * from "./thinking"
+export * from "./fetch"