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>

.gitignore

@@ -0,0 +1,11 @@
+# Secrets and cached credentials — never commit.
+.env
+**/.env
+.token-cache.json
+**/.token-cache.json
+
+# OS cruft
+.DS_Store
+
+# Node
+node_modules/