Merge pull request #311 from intellectronica/copilot/update-readme-accuracy-60771ff8-e85e-43dd-b6c1-01ab7c2ec8e5

Add missing `antigravity` agent to revert command docs

Author: intellectronica

README.md

@@ -319,7 +319,7 @@ ruler revert [options]
 | Option                         | Description                                                                                                                                                                                                                                                                   |
 | ------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | `--project-root <path>`        | Path to your project's root (default: current directory)                                                                                                                                                                                                                      |
-| `--agents <agent1,agent2,...>` | Comma-separated list of agent names to revert (agentsmd, aider, amazonqcli, amp, augmentcode, claude, cline, codex, copilot, crush, cursor, firebase, firebender, gemini-cli, goose, jules, junie, kilocode, kiro, opencode, openhands, qwen, roo, trae, warp, windsurf, zed) |
+| `--agents <agent1,agent2,...>` | Comma-separated list of agent names to revert (agentsmd, aider, amazonqcli, amp, antigravity, augmentcode, claude, cline, codex, copilot, crush, cursor, firebase, firebender, gemini-cli, goose, jules, junie, kilocode, kiro, opencode, openhands, qwen, roo, trae, warp, windsurf, zed) |
 | `--config <path>`              | Path to a custom `ruler.toml` configuration file                                                                                                                                                                                                                              |
 | `--keep-backups`               | Keep backup files (.bak) after restoration (default: false)                                                                                                                                                                                                                   |
 | `--dry-run`                    | Preview changes without actually reverting files                                                                                                                                                                                                                              |