feat: add Granola MCP skill with OAuth + auto-refresh

[bholagabbar]

Summary

Replaces the outdated CSV-based Granola skill with a fully working MCP integration using Granola's official Streamable HTTP endpoint.

What changed

• Full MCP support via mcporter connecting to https://mcp.granola.ai/mcp
• 4 tools: query_granola_meetings, list_meetings, get_meetings, get_meeting_transcript
• OAuth setup script: Handles dynamic client registration, PKCE flow, browser sign-in, and auto-configures mcporter
• Token refresh script: Refreshes the 6-hour access token using the stored refresh token, suitable for cron

How it works

1. scripts/oauth_setup.sh performs the full OAuth 2.0 PKCE flow (discovers endpoints, registers client, opens browser, captures callback, exchanges tokens)
2. scripts/refresh_token.sh refreshes tokens and updates mcporter config (run via cron every 5h)
3. All 4 Granola MCP tools are then available via mcporter call granola.<tool>

Supersedes

This replaces the approach in skills/mvanhorn/granola-notes/ which used CSV imports and shared note fetching. Granola now has official MCP support, making those workarounds unnecessary.

Testing

Tested live against mcp.granola.ai/mcp — full OAuth flow, token refresh, and all 4 tool calls confirmed working.

[openclaw-barnacle]

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