Orgchain v1.6.1: under Last act, a timed beat goes to whoever acted last

A timed or manual beat used to pay the holding being worked in. Now it pays
the holding behind the newest cued act or send; with nothing cued, Beat now
still pays the one being worked in. At a timed tempo, holdings race for it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01H4upF5LVwmPDDqrhdUfnXh

tests/money.test.js

@@ -8,7 +8,7 @@ import { getVin, getVout } from '../src/upstream/primitives.js';
 import { MetadataIndex } from '../src/adapters/metadata-index.js';
 import { lineageEvents, reduce } from '../src/orgchain/lineage.js';
 import { decodeLab, emptyLab, encodeLab, miningPreference, setRigs, setRule, setTempo, tick } from '../src/orgchain/store.js';
-import { act, gasCheck, lineageState, minerOf, seedSample, send } from '../src/orgchain/actions.js';
+import { act, gasCheck, lastHolding, lineageState, minerOf, seedSample, send } from '../src/orgchain/actions.js';
 import { FEE, PayWallet, REWARD, SAT, balances, brief, btc, ledger, most, owners, payerOf, satsOf, tankOf, tanks } from '../src/orgchain/money.js';
 import { keyOf } from '../src/orgchain/keys.js';
 
@@ -88,6 +88,14 @@ test('beats split across holdings by hashrate, or go whole to the last act', ()
   act(lab, 'decide', beta, { title: 'Clicked' });
   assert.deepEqual(mined(6), [['beta', REWARD]]);
   assert.equal(minerOf(lab, acme).length, 1);
+  setTempo(lab, 30, 1000);
+  act(lab, 'decide', acme, { title: 'First' }, 2000);
+  act(lab, 'decide', beta, { title: 'Last in' }, 3000);
+  assert.equal(lastHolding(lab), beta);
+  assert.equal(tick(lab, 32000, minerOf(lab, lastHolding(lab))), true);
+  assert.deepEqual(mined(7), [['beta', REWARD]]); // the race for a timed beat: whoever acted last takes it
+  assert.equal(lastHolding(lab), null);
+  setTempo(lab, 'each');
   assert.deepEqual(decodeLab(encodeLab(lab)).mining, { rule: 'last', rigs: { [acme]: 3 } });
   assert.throws(() => miningPreference({ rule: 'luck' }), /Invalid mining rule/);
   assert.throws(() => miningPreference({ rigs: { [acme]: 10 } }), /Invalid hashrate/);