feat(setup): implement antigravity integration setup and hook adapter…

README.md

@@ -35,7 +35,7 @@ https://github.com/user-attachments/assets/172685ba-8e54-4ea7-9ad1-e31a3398da72
 
 > _Like DeepWiki, but deeper._ DeepWiki helps you _understand_ code. GitNexus lets you _analyze_ it — because a knowledge graph tracks every relationship, not just descriptions.
 
-**TL;DR:** The **Web UI** is a quick way to chat with any repo. The **CLI + MCP** is how you make your AI agent actually reliable — it gives Cursor, Claude Code, Codex, and friends a deep architectural view of your codebase so they stop missing dependencies, breaking call chains, and shipping blind edits. Even smaller models get full architectural clarity, making it compete with Goliath models.
+**TL;DR:** The **Web UI** is a quick way to chat with any repo. The **CLI + MCP** is how you make your AI agent actually reliable — it gives Cursor, Claude Code, Antigravity, Codex, and friends a deep architectural view of your codebase so they stop missing dependencies, breaking call chains, and shipping blind edits. Even smaller models get full architectural clarity, making it compete with Goliath models.
 
 ---
 
@@ -48,7 +48,7 @@ https://github.com/user-attachments/assets/172685ba-8e54-4ea7-9ad1-e31a3398da72
 |             | **CLI + MCP**                                                         | **Web UI**                                                           |
 | ----------- | --------------------------------------------------------------------- | -------------------------------------------------------------------- |
 | **What**    | Index repos locally, connect AI agents via MCP                        | Visual graph explorer + AI chat in browser                           |
-| **For**     | Daily development with Cursor, Claude Code, Codex, Windsurf, OpenCode | Quick exploration, demos, one-off analysis                           |
+| **For**     | Daily development with Cursor, Claude Code, Antigravity, Codex, Windsurf, OpenCode | Quick exploration, demos, one-off analysis                           |
 | **Scale**   | Full repos, any size                                                  | Limited by browser memory (~5k files), or unlimited via backend mode |
 | **Install** | `npm install -g gitnexus`                                             | No install — [gitnexus.vercel.app](https://gitnexus.vercel.app)      |
 | **Storage** | LadybugDB native (fast, persistent)                                   | LadybugDB WASM (in-memory, per session)                              |
@@ -114,16 +114,20 @@ To configure MCP for your editor, run `npx gitnexus setup` once — or set it up
 
 ### Editor Support
 
-| Editor          | MCP | Skills | Hooks (auto-augment)                                                                    | Support      |
-| --------------- | --- | ------ | --------------------------------------------------------------------------------------- | ------------ |
-| **Claude Code** | Yes | Yes    | Yes (PreToolUse + PostToolUse)                                                          | **Full**     |
-| **Cursor**      | Yes | Yes    | Yes (postToolUse, [manual install](gitnexus-cursor-integration/README.md#hook-install)) | **Full**     |
-| **Codex**       | Yes | Yes    | —                                                                                       | MCP + Skills |
-| **Windsurf**    | Yes | —      | —                                                                                       | MCP          |
-| **OpenCode**    | Yes | Yes    | —                                                                                       | MCP + Skills |
+| Editor               | MCP | Skills | Hooks (auto-augment)                                                                    | Support      |
+| -------------------- | --- | ------ | --------------------------------------------------------------------------------------- | ------------ |
+| **Claude Code**      | Yes | Yes    | Yes (PreToolUse + PostToolUse)                                                          | **Full**     |
+| **Cursor**           | Yes | Yes    | Yes (postToolUse, [manual install](gitnexus-cursor-integration/README.md#hook-install)) | **Full**     |
+| **Antigravity** (Google) | Yes | Yes | Yes (AfterTool, [Gemini CLI hooks schema](https://geminicli.com/docs/hooks/reference/))[¹](#fn-antigravity-hooks) | **Full**     |
+| **Codex**            | Yes | Yes    | —                                                                                       | MCP + Skills |
+| **Windsurf**         | Yes | —      | —                                                                                       | MCP          |
+| **OpenCode**         | Yes | Yes    | —                                                                                       | MCP + Skills |
 
 > **Claude Code** gets the deepest integration: MCP tools + agent skills + PreToolUse hooks that enrich searches with graph context + PostToolUse hooks that detect a stale index after commits and prompt the agent to reindex.
 
+<a id="fn-antigravity-hooks"></a>
+> ¹ **Antigravity hooks** follow the [Gemini CLI hooks reference](https://geminicli.com/docs/hooks/reference/) (Antigravity 2.0 is the documented successor to Gemini CLI). Augmentation runs in `AfterTool` because `BeforeTool` has no context-injection channel in the Gemini contract — the agent sees graph context appended to the tool result via `hookSpecificOutput.additionalContext`. Stale-index hints land in the same channel after a successful `git commit/merge/rebase/cherry-pick/pull`. The schema may evolve if Antigravity-specific hook docs diverge from Gemini CLI's; the implementation will track those changes.
+
 ## Community Integrations
 
 Built by the community — not officially maintained, but worth checking out.
@@ -168,6 +172,21 @@ codex mcp add gitnexus -- npx -y gitnexus@latest mcp
 }
 ```
 
+**Antigravity** (Google) — `~/.gemini/antigravity/mcp_config.json`:
+
+```json
+{
+  "mcpServers": {
+    "gitnexus": {
+      "command": "npx",
+      "args": ["-y", "gitnexus@latest", "mcp"]
+    }
+  }
+}
+```
+
+> `gitnexus setup` also merges an `AfterTool` entry into `~/.gemini/settings.json` (under the canonical [Gemini CLI hooks schema](https://geminicli.com/docs/hooks/reference/)) and installs skills to `~/.gemini/antigravity/skills/`. Existing user hooks are preserved. The hook adapter's path is rewritten at install time, so run `gitnexus setup` rather than hand-editing.
+
 **OpenCode** (`~/.config/opencode/config.json`):
 
 ```json

gitnexus/README.md

@@ -2,7 +2,7 @@
 
 **Graph-powered code intelligence for AI agents.** Index any codebase into a knowledge graph, then query it via MCP or CLI.
 
-Works with **Cursor**, **Claude Code**, **Codex**, **Windsurf**, **Cline**, **OpenCode**, and any MCP-compatible tool.
+Works with **Cursor**, **Claude Code**, **Antigravity** (Google), **Codex**, **Windsurf**, **Cline**, **OpenCode**, and any MCP-compatible tool.
 
 [![npm version](https://img.shields.io/npm/v/gitnexus.svg)](https://www.npmjs.com/package/gitnexus)
 [![License: PolyForm Noncommercial](https://img.shields.io/badge/License-PolyForm%20Noncommercial-blue.svg)](https://polyformproject.org/licenses/noncommercial/1.0.0/)
@@ -34,6 +34,7 @@ To configure MCP for your editor, run `npx gitnexus setup` once — or set it up
 |--------|-----|--------|---------------------|---------|
 | **Claude Code** | Yes | Yes | Yes (PreToolUse) | **Full** |
 | **Cursor** | Yes | Yes | Yes (postToolUse, [manual install](../gitnexus-cursor-integration/README.md#hook-install)) | **Full** |
+| **Antigravity** (Google) | Yes | Yes | Yes (AfterTool, [Gemini CLI hooks schema](https://geminicli.com/docs/hooks/reference/)) | **Full** |
 | **Codex** | Yes | Yes | — | MCP + Skills |
 | **Windsurf** | Yes | — | — | MCP |
 | **OpenCode** | Yes | Yes | — | MCP + Skills |