Restore smooth realtime fall ballistics

scripts/test_gui_contracts.mjs

@@ -4,6 +4,7 @@ import assert from 'node:assert/strict';
 const html = fs.readFileSync(new URL('../www/index.html', import.meta.url), 'utf8');
 const main = fs.readFileSync(new URL('../www/main.js', import.meta.url), 'utf8');
 const audio = fs.readFileSync(new URL('../www/core/audio.js', import.meta.url), 'utf8');
+const realtime = fs.readFileSync(new URL('../www/views/realtime.js', import.meta.url), 'utf8');
 
 const styleSelect = html.match(/<select\b[^>]*\bid="styleSel"[^>]*>/)?.[0] || '';
 assert(styleSelect, 'style selector is missing');
@@ -29,5 +30,11 @@ assert(!/requestAnimationFrame/.test(audio),
   'audio transport must not create requestAnimationFrame loops that compete with the canvas loop');
 assert(!/while\s*\(pendingPhoenixFrame\)/.test(audio),
   'metrics transport must coalesce bursts instead of draining every queued state');
+assert(!/syncNativePeakHold/.test(realtime),
+  'native RTA peak anchors must not be copied directly into the visible hold line');
+assert((realtime.match(/applyPeakHold\(state, integrated, CONFIG, range\)/g) || []).length >= 3,
+  'every RTA engine must advance peak hold on the display clock');
+assert(/useIirEngine[^]*?applyRealtimeBarBallistics\(state, displayBase, CONFIG, range\)/.test(realtime),
+  'native IIR bars must advance their visible release on the display clock');
 
 console.log('GUI contract regression tests passed');