Initial FirstSales Developer API CLI release.\n\nIncludes:\n- firstsales whoami identity probe for API keys\n- firstsales doctor setup/auth check\n- broad public API command registry for agent workflows\n- JSON-first output, profile/base-url auth, idempotency keys, dry-run, and destructive --confirm handling\n\nVerified before release:\n- npm test\n- npm pack --dry-run --json\n- local credential/token pattern scan