Claude Code 2.1.225: OAuth token and MCP auth fixes, gateway spend limits

Mostly reliability work around authentication and Remote Control. The notable fix: a transient 401 could replace a long-lived `CLAUDE_CODE_OAUTH_TOKEN` with a stored login's short-lived token, breaking headless sessions until restart.

Tool: claude-code · Version: 2.1.225 · Significance: 2/5 · fix, feature