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>

.claude/skills/ms-todo/.env.example

@@ -0,0 +1,25 @@
+# Copy to ".env" in this folder and fill in. Git-ignored — never commit real values.
+
+# Application (client) ID of an Entra PUBLIC client app with the delegated
+# Tasks.ReadWrite permission. See references/setup.md.
+TODO_CLIENT_ID=00000000-0000-0000-0000-000000000000
+
+# Optional. Default "common" (work/school OR personal accounts).
+#   - a tenant GUID/domain  -> work/school accounts in that tenant only
+#   - "organizations"       -> any work/school account
+#   - "consumers"           -> personal Microsoft accounts only
+# TODO_TENANT_ID=common
+
+# Optional. Where to cache the signed-in token (refresh token).
+# Default: .token-cache.json next to scripts/. Keep it OUT of git.
+# TODO_TOKEN_CACHE=/absolute/path/to/.token-cache.json
+
+# Optional. Pin the loopback redirect port used during `login`. Default: the OS
+# picks a free port (works when http://localhost is registered, since Entra
+# ignores the port for loopback). Set this only if your tenant requires an exact
+# redirect URI, then register http://127.0.0.1:<port> in the app.
+# TODO_REDIRECT_PORT=53682
+
+# Optional. Time zone applied to --due / --start / --reminder dates (default UTC).
+# Accepts IANA (e.g. America/Denver) or Windows zone names.
+# TODO_TIMEZONE=UTC