Migrate the Gemini engine to Antigravity CLI

.github/aw/llms.md

@@ -22,7 +22,7 @@ curl -sf http://api-proxy:10000/reflect | jq '.endpoints[] | select(.configured)
 | `openai` / `codex` | 10000 | `http://api-proxy:10000/v1` | `OPENAI_API_KEY` |
 | `anthropic` | 10001 | `http://api-proxy:10001/v1` (or no `/v1` for native SDK) | `ANTHROPIC_API_KEY` |
 | `copilot` | 10002 | `http://api-proxy:10002/v1` | `COPILOT_GITHUB_TOKEN` |
-| `gemini` | 10003 | `http://api-proxy:10003/v1` | `GEMINI_API_KEY` |
+| `antigravity` | 10003 | `http://api-proxy:10003/v1` | `ANTIGRAVITY_API_KEY` |
 
 All ports use the OpenAI-compatible API format. The api-proxy injects auth headers automatically — **do not pass raw API keys** to these URLs.
 
@@ -34,7 +34,7 @@ All ports use the OpenAI-compatible API format. The api-proxy injects auth heade
     { "provider": "openai",    "port": 10000, "configured": true,  "models": ["gpt-4o", "o1-mini"], "models_url": "http://api-proxy:10000/v1/models" },
     { "provider": "anthropic", "port": 10001, "configured": true,  "models": ["claude-sonnet-4-5"],  "models_url": "http://api-proxy:10001/v1/models" },
     { "provider": "copilot",   "port": 10002, "configured": true,  "models": null,                   "models_url": "http://api-proxy:10002/models" },
-    { "provider": "gemini",    "port": 10003, "configured": false, "models": null,                   "models_url": null }
+    { "provider": "antigravity",    "port": 10003, "configured": false, "models": null,                   "models_url": null }
   ],
   "models_fetch_complete": true
 }
@@ -76,7 +76,7 @@ curl -sf http://api-proxy:10000/reflect \
   | jq -r '.endpoints[] | select(.provider == "openai" and .configured) | .models_url' \
   | xargs curl -sf | jq '[.data[].id]'
 
-# Gemini format → { models: [{name: "models/gemini-..."}] }
+# Antigravity format → { models: [{name: "models/antigravity-..."}] }
 curl -sf http://api-proxy:10003/v1/models | jq '[.models[].name | ltrimstr("models/")]'
 ```
 

.github/aw/subagents.md

@@ -62,8 +62,8 @@ Only two fields are supported inside a sub-agent frontmatter block:
 
 | Alias | Resolves to | When to use |
 |---|---|---|
-| `small` | `mini` → haiku, gpt-5-mini, gpt-5-nano, gemini-flash | Cheap, fast tasks: extraction, classification, formatting |
-| `large` | sonnet, gpt-5-pro, gpt-5, gemini-pro | Complex reasoning or synthesis tasks |
+| `small` | `mini` → haiku, gpt-5-mini, gpt-5-nano, antigravity-flash | Cheap, fast tasks: extraction, classification, formatting |
+| `large` | sonnet, gpt-5-pro, gpt-5, antigravity-pro | Complex reasoning or synthesis tasks |
 | `inherited` | Parent workflow model | Default — use when the sub-agent needs the same capability as the parent |
 
 All other fields (`engine`, `tools`, `network`, etc.) are stripped at runtime with a warning. Sub-agents inherit the parent's engine, tool access, and network configuration.
@@ -79,7 +79,7 @@ Sub-agent files are written to the directory and with the extension each engine
 | Copilot (default) | `.agents/agents/` | `.agent.md` |
 | Claude | `.claude/agents/` | `.md` |
 | Codex | `.codex/agents/` | `.md` |
-| Gemini | `.gemini/agents/` | `.md` |
+| Antigravity | `.antigravity/agents/` | `.md` |
 
 The engine is detected at compile time from the `engine:` field and injected as `GH_AW_ENGINE_ID` into the interpolation step's environment.
 

.github/aw/syntax.md

@@ -395,12 +395,12 @@ The YAML frontmatter supports these fields:
     ```
 
 - **`engine:`** - AI processor configuration
-  - String format: `"copilot"` (default, recommended), `"claude"`, `"codex"`, `"gemini"`, or `"opencode"` (experimental)
+  - String format: `"copilot"` (default, recommended), `"claude"`, `"codex"`, `"antigravity"`, or `"opencode"` (experimental)
   - Object format for extended configuration:
 
     ```yaml
     engine:
-      id: copilot                       # Required: coding agent identifier (copilot, claude, codex, gemini, or opencode)
+      id: copilot                       # Required: coding agent identifier (copilot, claude, codex, antigravity, or opencode)
       version: beta                     # Optional: version of the action (has sensible default); also accepts GitHub Actions expressions: ${{ inputs.engine-version }}
       model: gpt-5                      # Optional: LLM model to use (has sensible default)
       agent: technical-doc-writer       # Optional: custom agent file (Copilot only, references .github/agents/{agent}.agent.md)
@@ -412,7 +412,7 @@ The YAML frontmatter supports these fields:
       args: ["--verbose"]               # Optional: custom CLI arguments injected before prompt (array)
       api-target: api.acme.ghe.com      # Optional: custom API endpoint hostname for GHEC/GHES (hostname only, no protocol/path)
       command: /usr/local/bin/copilot   # Optional: override default engine executable (skips installation)
-      bare: true                        # Optional: disable automatic context loading (copilot: --no-custom-instructions; claude: --bare; codex: --no-system-prompt; gemini: GEMINI_SYSTEM_MD=/dev/null). Default: false
+      bare: true                        # Optional: disable automatic context loading (copilot: --no-custom-instructions; claude: --bare; codex: unsupported; antigravity: unsupported). Default: false
       user-agent: "myapp/1.0"           # Optional: custom user agent string (codex engine only)
       config: |                         # Optional: additional TOML config appended to config.toml (codex engine only)
         [extra]
@@ -426,7 +426,7 @@ The YAML frontmatter supports these fields:
     ```
 
   - **Note**: The `version`, `model`, and `max-turns` fields have sensible defaults and can typically be omitted unless you need specific customization.
-  - **`gemini` engine**: Google Gemini CLI. Requires `GEMINI_API_KEY` secret. Does not support `max-turns`, `web-fetch`, or `web-search`. Supports AWF firewall and LLM gateway.
+  - **`antigravity` engine**: Antigravity CLI. Requires `ANTIGRAVITY_API_KEY` secret. Does not support `max-turns`, `web-fetch`, or `web-search`. Supports AWF firewall and LLM gateway.
   - **`opencode` engine** (experimental): Provider-agnostic, open-source AI coding agent (BYOK). Defaults to Copilot routing via `COPILOT_GITHUB_TOKEN` (or `${{ github.token }}` with `copilot-requests` feature). Supports 75+ models via `provider/model` format. Supports AWF firewall and LLM gateway.
 
 - **`network:`** - Network access control for AI engines (top-level field)