One prompt. Your agent does the rest.

You are my install assistant. Install the Antigravity SEO extension from GitHub into my Google Antigravity config, end to end, without asking me to run anything manually.

REPO:     https://github.com/dotusmanali/antigravity-seo
BRANCH:   main
TARGET:   ~/.gemini/extensions/seo   (on Windows: %USERPROFILE%\.gemini\extensions\seo)
SETTINGS: ~/.gemini/settings.json    (Windows: %USERPROFILE%\.gemini\settings.json)

Do exactly this, in order. Stop and show me the error if any step fails.

1.  Verify Google Antigravity is installed (the ~/.gemini folder must already exist). If it does not, stop and tell me to install Antigravity first from https://antigravity.google.
2.  Back up ~/.gemini/settings.json to ~/.gemini/logs/antigravity-seo/backups/ before touching it.
3.  Download the main branch (git clone or the main.tar.gz tarball) into a temp dir. Create the TARGET folder and copy the repo's contents into it — the skills/, agents/, commands/, scripts/, tools/, templates/ folders and the top-level JSON files (registry.json, manifest.json, plugin.json, mcp_config.json, hooks.json) plus requirements.txt. Do not touch anything else under ~/.gemini/.
4.  Install Python dependencies:
       python3 -m pip install -r <TARGET>/requirements.txt
5.  Build and validate the skill/agent registry:
       python3 <TARGET>/tools/build_registry.py
    It must print "registry.json written" and exit 0. If it reports broken links or orphan skills, stop and show me the output.
6.  Register the extension in settings.json (append-only, merge — never overwrite existing keys):
       python3 <TARGET>/tools/register_extension.py
7.  Verify the environment (MCP servers, env vars, CLI tools):
       python3 <TARGET>/tools/verify_environment.py --json
    For every missing item it reports, install it or ask me for the value (never invent secrets, never write API keys to disk outside the OS keyring or a local .env I control).
8.  Confirm success by printing:
       - final TARGET path
       - number of skills, agents, and commands loaded
       - list of MCP servers detected
       - the exact command I should run next: "/seo:audit https://<my-site>"

Rules:
- Never delete or rewrite files outside <TARGET> and the single "extensions.seo" block in settings.json.
- Never echo, log, or transmit any API key, token, or secret value.
- If any step fails, print the full error and the recovery file at ~/.gemini/logs/antigravity-seo/last-error.md, then stop.

When everything above passes, tell me to restart Antigravity, then reply with "Antigravity SEO ready" and nothing else.