updated docs

docs/data/en/artery-google.md

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+# Google Vein
+
+Status: **building**
+
+Connects soleprint to Google services. OAuth2 flow is implemented. Sheets read access works. Calendar and Drive are next.
+
+---
+
+## What Works
+
+**OAuth2 authentication** -- full flow with authorization URL generation, code exchange, token refresh, and user identity extraction. Supports both identity (OpenID Connect) and API access scopes.
+
+**Google Sheets** -- read-only access to spreadsheet data.
+
+## Configuration
+
+Create a `.env` file in the vein directory:
+
+```env
+GOOGLE_CLIENT_ID=your-client-id
+GOOGLE_CLIENT_SECRET=your-client-secret
+GOOGLE_REDIRECT_URI=http://localhost:12000/artery/google/oauth/callback
+API_PORT=8003
+```
+
+You need a Google Cloud project with OAuth consent screen configured and credentials created.
+
+## OAuth Scopes
+
+Identity scopes (default):
+
+- `openid`
+- `userinfo.email`
+- `userinfo.profile`
+
+API scopes (added when needed):
+
+- `spreadsheets.readonly`
+- `drive.readonly`
+
+## What's Coming
+
+- Calendar integration
+- Drive file browsing and download
+- Full Sheets write support
+
+Configuration details will be added as these integrations mature.
+
+## Running Standalone
+
+```bash
+cd soleprint/artery/veins/google
+python run.py
+# Runs on port 8003
+```