feat(machine): consume get_machine_config over the transport (#71)

Source the operator pubkey + fee config from LNbits via the get_machine_config
kind-21000 RPC (spirekeeper#41) right after list_wallets, instead of the
operator pubkey coming only from VITE_OPERATOR_PUBKEYS (env). A seed-only
machine (blank .env) had an empty operator allowlist → the fees/operator-config
services disabled themselves → permanent "awaiting configuration". Now it pulls
its config over the already-authenticated channel and configures itself with
zero per-machine provisioning — closing bitspire#70 P1.

- LnbitsClient.getMachineConfig() → sendRpc('get_machine_config') + the
  MachineConfigResponse / FeeConfigWire types.
- lightning.ts, only when VITE_OPERATOR_PUBKEYS is empty (env override still
  wins): set CONFIG.operatorPubkeys from operator_pubkey (re-enables the
  services), and persist fee_config via the existing applyFeeConfig IPC (mapping
  snake_case → camelCase) so atm.ts's awaiting-fees gate clears immediately —
  robust to the replaceable kind-30078 not being fetchable from the relay. The
  live kind-30078 subscription still handles mid-run fee updates.
- Soft-fail: older spirekeeper (no RPC) or a transport error falls back to the
  env/kind-30078 path.

lnbits + machine typecheck clean; lnbits suite 29 pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

packages/lnbits/src/client.ts

@@ -37,6 +37,7 @@ import type {
   CreateInvoiceBody,
   PayInvoiceBody,
   WalletInfo,
+  MachineConfigResponse,
   SubscribePaymentsBody,
   SubscribeAck,
   PaymentPushCallback,
@@ -210,6 +211,17 @@ export class LnbitsClient {
     return data ?? []
   }
 
+  /** Pull server-delivered machine config (operator pubkey + fee config) over
+   * the authenticated transport — spirekeeper's `get_machine_config` RPC
+   * (bitspire#70 P1). Lets a seed-only ATM configure itself with no per-machine
+   * env provisioning. Rejects (LnbitsRpcError) if the server hasn't registered
+   * the RPC (older spirekeeper) — callers should soft-fall-back. */
+  async getMachineConfig(): Promise<MachineConfigResponse> {
+    return this.idempotent(() =>
+      this.sendRpc<MachineConfigResponse>('get_machine_config', {}),
+    )
+  }
+
   // ============================================================================
   // Invoices
   // ============================================================================

packages/lnbits/src/types.ts

@@ -274,3 +274,30 @@ export type PaymentPushCallback = (payment: LnbitsPayment) => void
 
 /** Called when the subscription has been closed (by TTL or explicit unsubscribe). */
 export type SubscriptionCloseCallback = (reason: 'ttl' | 'unsubscribed') => void
+
+// ============================================================================
+// get_machine_config RPC (spirekeeper#41 / bitspire#70 P1)
+// ============================================================================
+
+/** Fee-config wire shape inside `get_machine_config` — mirrors spirekeeper's
+ * `FeeConfigPayload.to_wire_dict()` (snake_case). */
+export interface FeeConfigWire {
+  schema_version: number
+  cash_in_fee_fraction: number
+  cash_out_fee_fraction: number
+  components?: Record<string, number>
+}
+
+/** Response of the `get_machine_config` RPC: the operator pubkey + fee config
+ * (+ fiat, ids) LNbits delivers to a paired ATM over the authenticated
+ * transport, so a seed-only machine needs no per-machine env provisioning.
+ * `fee_config` is null until the operator has a super-config. */
+export interface MachineConfigResponse {
+  operator_pubkey: string
+  fee_config: FeeConfigWire | null
+  fiat_code: string
+  machine_npub: string
+  wallet_id: string
+  /** Freshness watermark (unix s) for the consumer's fee-config replay guard. */
+  created_at: number
+}