Initial commit — Antigravity plugin v0.1.0

Plugin Claude Code miroir du plugin codex officiel d'OpenAI, mais
pour Google Antigravity (agy CLI). Headless via:

  agy --print --dangerously-skip-permissions --print-timeout 10m

Includes:
- 1 forwarder agent (antigravity-rescue)
- 5 slash commands (setup, rescue, status, result, cancel)
- 3 internal skills (cli-runtime, result-handling, gemini-prompting)
- agy-companion.mjs runtime (task / setup / status / result / cancel)
- marketplace.json for `/plugin marketplace add`

Tested: setup OK, foreground task OK, background workflow OK
(except OAuth refresh which requires interactive TTY).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.claude-plugin/marketplace.json

@@ -0,0 +1,17 @@
+{
+  "name": "antigravity-local",
+  "owner": {
+    "name": "Ambassadia / Olivier Dupont"
+  },
+  "metadata": {
+    "description": "Local marketplace exposing the Antigravity (agy) plugin",
+    "version": "0.1.0"
+  },
+  "plugins": [
+    {
+      "name": "antigravity",
+      "source": "./",
+      "description": "Use Google's Antigravity (agy) from Claude Code to delegate tasks to Gemini in headless mode."
+    }
+  ]
+}

.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "antigravity",
+  "version": "0.1.0",
+  "description": "Use Google's Antigravity (agy) from Claude Code to delegate tasks to Gemini in headless mode.",
+  "author": {
+    "name": "Ambassadia / Olivier Dupont"
+  },
+  "homepage": "https://antigravity.google"
+}