feat: add regolith onboard CLI wizard with daemon installation

- Interactive setup wizard: deps check, env config, WhatsApp auth, daemon install, health check
- CLI entry point via yargs with bin registration (regolith onboard)
- Flags: --install-daemon, --non-interactive, --pairing-code, --json, --skip-*
- launchd (macOS) and systemd (Linux) service installation
- Refactored whatsapp-auth.ts to export authenticate() for programmatic use
- 72 tests across 6 test files
- Updated README.md and CLAUDE.md with onboard CLI docs

src/cli/types.ts

@@ -0,0 +1,31 @@
+export interface WizardFlags {
+  installDaemon: boolean;
+  nonInteractive: boolean;
+  pairingCode: boolean;
+  json: boolean;
+  skipDeps: boolean;
+  skipEnv: boolean;
+  skipWhatsapp: boolean;
+  skipHealth: boolean;
+}
+
+export interface StepResult {
+  name: string;
+  status: 'passed' | 'failed' | 'skipped' | 'warning';
+  message: string;
+  details?: Record<string, unknown>;
+}
+
+export interface WizardContext {
+  flags: WizardFlags;
+  projectRoot: string;
+  platform: 'darwin' | 'linux';
+  envValues: Record<string, string>;
+  containerRuntime: 'apple-container' | 'docker' | null;
+  containerVersion: string | null;
+  whatsappAuthed: boolean;
+  daemonInstalled: boolean;
+  results: StepResult[];
+}
+
+export type WizardStep = (ctx: WizardContext) => Promise<StepResult>;