docs(agy): add quota management and failover documentation

- Add ccs cliproxy doctor command to help text
- Document Antigravity auto-failover in README

README.md

@@ -187,6 +187,14 @@ ccs sync
 
 Re-creates symlinks for shared commands, skills, and settings.
 
+### Antigravity Quota Management
+
+```bash
+ccs cliproxy doctor     # Check quota status for all agy accounts
+```
+
+**Auto-Failover**: When an Antigravity account runs out of quota, CCS automatically switches to another account with remaining capacity. Shared GCP project accounts are excluded (pooled quota).
+
 <br>
 
 ## Configuration

src/commands/help-command.ts

@@ -256,6 +256,7 @@ Run ${color('ccs config', 'command')} for web dashboard`.trim();
   printSubSection('CLI Proxy Plus Management', [
     ['ccs cliproxy', 'Show CLIProxy Plus status and version'],
     ['ccs cliproxy --help', 'Full CLIProxy Plus management help'],
+    ['ccs cliproxy doctor', 'Quota diagnostics (Antigravity)'],
     ['ccs cliproxy --install <ver>', 'Install specific version (e.g., 6.6.6)'],
     ['ccs cliproxy --latest', 'Update to latest version'],
   ]);