Closes #63

Summary

Adds support for a GOOGLE_MCP_PROFILE environment variable that stores OAuth tokens in profile-specific subdirectories, enabling multiple Google accounts across different projects.

Change

A two-line addition to getConfigDir() in src/auth.ts:

const profile = process.env.GOOGLE_MCP_PROFILE;
return profile ? path.join(baseDir, profile) : baseDir;

Token storage with profiles

~/.config/google-docs-mcp/
├── token.json                # default (no profile)
├── work/token.json           # GOOGLE_MCP_PROFILE=work
├── personal/token.json       # GOOGLE_MCP_PROFILE=personal

Usage

{
  "mcpServers": {
    "google-docs": {
      "env": {
        "GOOGLE_CLIENT_ID": "...",
        "GOOGLE_CLIENT_SECRET": "...",
        "GOOGLE_MCP_PROFILE": "work"
      }
    }
  }
}

Backward compatible

Without GOOGLE_MCP_PROFILE set, behavior is unchanged — tokens are stored in the default location.

Test plan

• Existing tests pass (107/107)
• Prettier formatting check passes
• Verified: with profile set, token is stored in subdirectory
• Verified: without profile set, falls back to default path