feat(cli): add user management CLI commands (list, create, update, delete)

[aaight]

Summary

• Add cascade users list — displays table of org users (ID, Email, Name, Role, Created) with --json support
• Add cascade users create --email --password --name [--role] — creates a new user via tRPC
• Add cascade users update <id> [--name] [--email] [--role] [--password] — updates user fields via tRPC
• Add cascade users delete <id> --yes — deletes a user with confirmation guard

All commands live in src/cli/dashboard/users/, extend DashboardCommand, and follow the credentials/ CLI pattern exactly (oclif flags, tRPC calls, --json output, error handling).

Closes: https://trello.com/c/fzNezXRd/322-as-an-admin-i-want-cli-commands-to-manage-users-so-that-i-can-add-list-update-delete-users-from-the-terminal

Test plan

• npm run typecheck passes (zero errors)
• npm run lint:fix passes (no changes needed)
• npm test passes (4667 tests, 269 test files)
• Manual: cascade users list shows a user table
• Manual: cascade users create --email x@y.com --password p --name "Test User" creates a user
• Manual: cascade users update <id> --name "New Name" updates the user
• Manual: cascade users delete <id> --yes deletes the user

🤖 Generated with Claude Code

[nhopeatall]

Summary

LGTM — Clean implementation that follows the established credentials/ CLI pattern exactly. All four commands (list, create, update, delete) are thin tRPC adapters with consistent flag definitions, error handling, and --json output support.

Verified:

• tRPC usersRouter exists with matching list, create, update, delete endpoints and proper authorization (adminProcedure, superadmin guards)
• oclif auto-discovers users/ via existing glob pattern in package.json
• formatDate import in list.ts resolves correctly from _shared/format.ts
• role flag uses options constraint so the type cast is safe
• No test coverage, consistent with existing CLI commands (credentials also has none)
• All CI checks pass (typecheck, lint, 4667 tests)