Expire submitted quotes using latest inventory snapshot

Proof: Fixes quote outcome expiry so no-settlement submissions age to not_filled using the latest durable inventory snapshot, even when the last actual inventory movement is older.

Assumptions: A later unchanged inventory snapshot after the quote deadline plus settlement grace is valid evidence that no matching settled inventory delta occurred in the repo-owned path.

Still fake: Not-filled remains inferred from deadline plus inventory evidence until venue-native terminal outcome events are persisted.

src/core/quote-outcomes.mjs

@@ -37,9 +37,7 @@ export function deriveQuoteOutcomeRecords({
     inventorySnapshots,
     activeAssetIds,
   });
-  const latestInventoryAt = inventoryDeltas.length
+  const latestInventoryAt = latestSnapshotTimestamp(inventorySnapshots);
-    ? inventoryDeltas[inventoryDeltas.length - 1].observed_at
-    : latestSnapshotTimestamp(inventorySnapshots);
   const candidatesByMovement = new Map();
   const candidatesByQuote = new Map();
 

test/quote-outcomes.test.mjs

@@ -130,6 +130,34 @@ test('submitted quote without settlement becomes not filled only after deadline
   assert.equal(outcome.attributed_inventory_delta, null);
 });
 
+test('older unrelated inventory movement does not block later no-fill expiry', () => {
+  const [outcome] = deriveQuoteOutcomeRecords({
+    submissions: [submittedResult('quote-after-old-move', '2026-04-02T18:20:00.000Z')],
+    commands: [exactOutCommand('quote-after-old-move')],
+    inventorySnapshots: [
+      inventorySnapshot('2026-04-02T18:13:00.000Z', {
+        [BTC.assetId]: '0',
+        [EURE.assetId]: '100000000000000000000',
+      }),
+      inventorySnapshot('2026-04-02T18:13:33.000Z', {
+        [BTC.assetId]: '1',
+        [EURE.assetId]: '99999999999999999999',
+      }),
+      inventorySnapshot('2026-04-02T18:22:00.000Z', {
+        [BTC.assetId]: '1',
+        [EURE.assetId]: '99999999999999999999',
+      }),
+    ],
+    btcAsset: BTC,
+    eureAsset: EURE,
+    now: '2026-04-02T18:22:00.000Z',
+  });
+
+  assert.equal(outcome.outcome_status, 'not_filled');
+  assert.equal(outcome.outcome_reason, 'deadline_elapsed_without_settlement');
+  assert.equal(outcome.payload.evidence.latest_inventory_observed_at, '2026-04-02T18:22:00.000Z');
+});
+
 test('ambiguous inventory movement is not counted as completed settlement', () => {
   const outcomes = deriveQuoteOutcomeRecords({
     submissions: [