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(' ')
+}