Initial commit: Microsoft To Do for Claude (skill + .mcpb extension)

Claude Code skill (CLI over Microsoft Graph, delegated auth-code + PKCE) and a
Claude Desktop .mcpb extension sharing one dependency-free core client.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mcp-extension/.gitignore

@@ -0,0 +1,9 @@
+# Generated / bundled artifacts
+node_modules/
+# synced from the skill by scripts/sync-core.mjs
+server/lib/graph.mjs
+*.mcpb
+
+# Signing material — NEVER commit the private key
+key.pem
+cert.pem