fix(logging): finish the object-argument sweep

#107 caught three sites by grepping for an object literal as the second
console argument. That pattern misses the more common form, a variable
holding an object, so five more were still landing in the journal as
[object Object]. This time the list came from the machine itself: every
distinct such line in three days of sintra's journal.

The five: the bay list at HAL init, the inventory loaded from state.db,
the inventory pushed to the renderer, the amounts sent to a dispense, and
the access-control audit record. Three sibling sites in the mock and
service paths are fixed too; they had not run recently enough to appear
in the journal but carry the same shapes.

The audit line is the one that mattered. It is the entire record of who
was granted or denied terminal access until #90 persists it to state.db,
and every field of it was being discarded.

formatBays and formatInventory render the denomination/count shapes these
sites share. `count` is optional on a device-config cassette, so an
absent one prints as unknown rather than as zero, which would read as a
drained bay.

apps/machine/src/lib/utils.ts

@@ -5,3 +5,26 @@ import { twMerge } from 'tailwind-merge'
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
+
+/**
+ * Render a denomination/count list for the journal.
+ *
+ * Electron's console bridge stringifies every console argument on its way to
+ * the journal, so passing the array itself arrives as `[object Object]` and
+ * the numbers are lost. Interpolate one of these instead. See CLAUDE.md,
+ * "Useful invariants when debugging".
+ */
+export function formatBays(rows: { denomination: number; count?: number }[]): string {
+  if (!rows?.length) return '(none)'
+  // `count` is optional on a device-config cassette: a preset can declare the
+  // denomination a bay holds without claiming how many notes are in it. Show
+  // that as unknown rather than as zero, which would read as a drained bay.
+  return rows.map((r) => `${r.denomination}x${r.count ?? '?'}`).join(' ')
+}
+
+/** Same, for a denomination-keyed count map as `getInventory()` returns. */
+export function formatInventory(inv: Record<number, number>): string {
+  const entries = Object.entries(inv ?? {})
+  if (!entries.length) return '(none)'
+  return entries.map(([denom, count]) => `${denom}x${count}`).join(' ')
+}

apps/machine/src/services/hal.ts

@@ -15,6 +15,7 @@
  */
 
 import type { ATMServices } from '@bitSpire/state-machine'
+import { formatBays } from '@/lib/utils'
 
 export interface CassetteConfig {
   denomination: number
@@ -126,7 +127,7 @@ export async function initializeHalServices(config: HalConfig): Promise<HalServi
 
   const atmServices: Pick<ATMServices, 'dispenseCash' | 'getInventory'> = {
     dispenseCash: async (amounts) => {
-      console.log('[HAL] Dispensing:', amounts)
+      console.log(`[HAL] Dispensing: ${formatBays(amounts)}`)
 
       // Re-initialize dispenser if it was closed after a previous error
       if (!dispenser.initialized) {

apps/machine/src/services/lightning.ts

@@ -21,6 +21,7 @@ import type { ATMServices, ATMContext } from '@bitSpire/state-machine'
 
 // Import Electron types
 import type {} from '@/types/electron'
+import { formatBays, formatInventory } from '@/lib/utils'
 
 // Check if we're running in Electron (electronAPI is exposed via preload)
 const isElectron = typeof window !== 'undefined' && window.electronAPI !== undefined
@@ -1092,7 +1093,7 @@ export function createATMServices(
      * Dispense cash (mock for development)
      */
     dispenseCash: async (amounts) => {
-      console.log('[ATM Service] Dispensing cash:', amounts)
+      console.log(`[ATM Service] Dispensing cash: ${formatBays(amounts)}`)
 
       // In production, this would interface with the Rust HAL
       // For now, simulate dispense delay
@@ -1269,7 +1270,7 @@ export function createATMServices(
         20: 50, // 50 x $20 bills = $1000 capacity
       }
 
-      console.log('[ATM Service] Inventory:', inventory)
+      console.log(`[ATM Service] Inventory: ${formatInventory(inventory)}`)
       return inventory
     },
   }

apps/machine/src/stores/atm.ts

@@ -15,6 +15,7 @@ import { initializeLightningServices, fetchBtcPrice } from '@/services/lightning
 import { classifyInitError } from '@/services/init-error'
 import { startOperatorConfigService, type OperatorConfigService } from '@/services/operator-config'
 import { startOperatorFeesService, type OperatorFeesService } from '@/services/operator-fees'
+import { formatBays, formatInventory } from '@/lib/utils'
 import type { HalConfig, HalServices } from '@/services/hal'
 import type { MachineModel } from '@/config'
 import type { LightningBackend } from '@/services/lightning'
@@ -179,7 +180,7 @@ async function loadInventoryFromDb(): Promise<Record<number, number> | null> {
   if (isElectron && window.electronAPI) {
     try {
       const inv = await window.electronAPI.getInventory()
-      console.log('[ATM] Loaded inventory from DB:', inv)
+      console.log(`[ATM] Loaded inventory from DB: ${formatInventory(inv)}`)
       return inv
     } catch (e) {
       console.warn('[ATM] Failed to load inventory from DB:', e)
@@ -245,7 +246,7 @@ const mockServices: ATMServices = {
   },
 
   dispenseCash: async (amounts) => {
-    console.log('[Mock] Dispensing cash:', amounts)
+    console.log(`[Mock] Dispensing cash: ${formatBays(amounts)}`)
     await new Promise((resolve) => setTimeout(resolve, 2000))
     return {
       bills: amounts.map((a) => ({
@@ -474,7 +475,7 @@ export const useAtmStore = defineStore('atm', () => {
     // the availability beacon kept advertising a full cassette.
     if (inv === null) return
     persistedInventory.value = inv
-    console.log('[ATM] Persisted inventory updated:', inv)
+    console.log(`[ATM] Persisted inventory updated: ${formatInventory(inv)}`)
   }
 
   /** Detect Bitcoin network from a BOLT-11 invoice prefix (called once, persisted) */
@@ -1589,7 +1590,7 @@ export const useAtmStore = defineStore('atm', () => {
     console.log('[ATM] Fiat currency:', devConfig.fiatCode)
     console.log('[ATM] Validator device:', devConfig.validator.device)
     console.log('[ATM] Dispenser device:', devConfig.dispenser.device)
-    console.log('[ATM] Cassettes:', devConfig.dispenser.cassettes)
+    console.log(`[ATM] Cassettes: ${formatBays(devConfig.dispenser.cassettes)}`)
 
     const halConfig = toHalConfig(devConfig)
     await initializeWithHalIpc(halConfig)
@@ -1662,7 +1663,7 @@ export const useAtmStore = defineStore('atm', () => {
       // HAL dispenseCash via IPC
       const halAtmServices: Pick<ATMServices, 'dispenseCash' | 'getInventory'> = {
         dispenseCash: async (amounts) => {
-          console.log('[ATM] Dispensing via IPC:', amounts)
+          console.log(`[ATM] Dispensing via IPC: ${formatBays(amounts)}`)
           return await api.halDispense(amounts)
         },
         getInventory: async () => {
@@ -1850,15 +1851,15 @@ export const useAtmStore = defineStore('atm', () => {
     credentialIdHash: string
     reason?: string
   }) {
-    console.info('[Access] audit', {
-      result: outcome.result,
-      role: outcome.role ?? null,
-      // Truncate the hash in logs — it's already non-reversible, but no need to
-      // splash the full value across the journal.
-      credentialIdHash: outcome.credentialIdHash.slice(0, 12),
-      reason: outcome.reason ?? null,
-      at: Date.now(),
-    })
+    // Truncate the hash — it's already non-reversible, but no need to splash
+    // the full value across the journal. Interpolated rather than passed as an
+    // object: the console bridge would stringify it to `[object Object]` and
+    // this line is the audit trail until #90 persists it to state.db.
+    console.info(
+      `[Access] audit result=${outcome.result} role=${outcome.role ?? 'none'} ` +
+        `hash=${outcome.credentialIdHash.slice(0, 12)} ` +
+        `reason=${outcome.reason ?? 'none'} at=${Date.now()}`
+    )
   }
 
   /** Grant terminal access after a credential (and any PIN) is authorized. */