feat: add Gemini Antigravity 2.0 integration

.gitignore

@@ -225,5 +225,6 @@ tasks/
 
 # Claude Code integration generated files
 integrations/claude-code/converter/generated/
+integrations/antigravity/converter/generated/
 .cursorrules
 bun.lock

integrations/antigravity/README.md

@@ -0,0 +1,107 @@
+# OpenAgents Control ↔ Gemini Antigravity CLI Integration
+
+A bridge that allows Gemini Antigravity 2.0 (Antigravity CLI 1.0) to use OpenAgents Control standards, subagents, and context files.
+
+## Overview
+
+This integration provides a seamless bridge between OpenAgents Control and Gemini Antigravity CLI (`agy`):
+
+1. **Auto-Convert**: Compiles OpenAgents Control's agent specifications into Antigravity CLI-native plugins
+2. **Global & Local Workspaces**: Deploys plugins globally for all projects or locally under repository workspaces
+
+## Directory Structure
+
+```
+integrations/antigravity/
+├── README.md               # This guide
+├── install-antigravity.sh  # Build & installation script (Global & Local)
+└── converter/              # Conversion subsystem
+    ├── package.json        # Dependencies
+    └── src/
+        └── convert-agents.js # Node-based compiler and YAML mapper
+```
+
+## Quick Start
+
+### 1. Compile & Install the Plugin
+
+To compile OAC agents and install the plugin to your Antigravity environments, run:
+
+```bash
+cd integrations/antigravity
+./install-antigravity.sh
+```
+
+This will automatically:
+1. Translate `.opencode/agent/*.md` specifications to Antigravity format in `integrations/antigravity/generated/`.
+2. Generate the necessary `plugin.json` manifest.
+3. Install the plugin globally to `~/.gemini/antigravity-cli/plugins/openagents-control-bridge`.
+4. Install the plugin locally to `.agents/plugins/openagents-control-bridge` for workspace-specific runs.
+
+### 2. Verify in Antigravity CLI
+
+Start your Antigravity session and verify that the plugin has loaded correctly:
+
+```bash
+# Start your CLI session
+agy
+
+# Inspect active subagents and skills
+/agents
+/skills
+```
+
+You should see `openagents-control-standards` and `context-scout` registered and active.
+
+---
+
+## How It Works
+
+### Context Discovery & Pre-loading
+
+1. **Skill Triggers**: The `openagents-control-standards` Skill triggers automatically before any development or architectural task.
+2. **Subagent Invocation**: The skill delegates to `context-scout` to search `.opencode/context/` for relevant conventions, naming standards, and workflows.
+3. **Upfront Loading**: Discovered files are read and pre-loaded into the prompt context to keep subsequent task execution fast, consistent, and highly token-efficient.
+
+### Agent Specification Mapping
+
+The converter translates OAC agent frontmatter properties to Antigravity CLI specifications:
+
+| OpenAgents Control Field | Gemini Antigravity Field | Notes / Conversions |
+|--------------------------|--------------------------|---------------------|
+| `id`                     | `name`                   | Uniquely names the subagent |
+| `description`            | `description`            | Description used for auto-routing |
+| `permissions`            | `tools`                  | Maps `read` ➔ `read_file`, `write` ➔ `write_file`, `edit` ➔ `edit_file`, `bash` ➔ `run_command`, `grep` ➔ `grep_search`, `glob` ➔ `list_dir` |
+| `model`                  | `model`                  | Translates models to user-approved designations: Grok/Sonnet ➔ `gemini-3.1-pro`, Haiku ➔ `gemini-3.5-flash` |
+| `mode: subagent`         | `permissionMode: plan`   | Restricts executing subagents to planned/approved paths |
+
+---
+
+## Adding Custom Agents & Workflows
+
+### For Local Workspace Use
+Add your customized agent definitions under `.agents/agents/` and skills under `.agents/skills/`. The Antigravity Agent will auto-load them upon starting a session inside the workspace root.
+
+### For Global Distribution
+1. Place the new OAC agent configuration in `.opencode/agent/{category}/{agent}.md`.
+2. Run the compiler installer: `./install-antigravity.sh`
+3. Your updated agent will instantly be active across all your CLI sessions.
+
+## Requirements
+
+- Node.js 18+
+- Gemini Antigravity CLI 1.0+ (with local plugin-loading enabled for repo-level runs)
+
+---
+
+## Command Reference
+
+| Action | Claude Code CLI | Gemini Antigravity CLI |
+|--------|-----------------|------------------------|
+| Start interactive run | `claude` | `agy` |
+| Browse Active Skills | `/print-plugins` | `/skills` |
+| Browse Active Subagents| `/print-plugins` | `/agents` |
+| Settings & Config | `~/.claude/settings.json` | `/config` or `/settings` |
+| Keybindings Map | `/keybindings` | `/keybindings` |
+| Directory Search | `/glob` / `/grep` | `@` (autocomplete) or `/skills` search |
+| Run single bash command| `!command` | `!command` |

integrations/antigravity/converter/package.json

@@ -0,0 +1,11 @@
+{
+  "name": "oac-antigravity-converter",
+  "version": "1.0.0",
+  "description": "Converts OpenAgents Control agents and skills to Antigravity CLI format",
+  "main": "src/convert-agents.js",
+  "scripts": {
+    "convert": "node src/convert-agents.js"
+  },
+  "author": "Antigravity",
+  "license": "MIT"
+}