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');

scripts/test_rta_profile.mjs

@@ -2,7 +2,12 @@ import assert from 'node:assert/strict';
 import fs from 'node:fs';
 import vm from 'node:vm';
 import { getRtwCenters } from '../www/core/rtw_centers.js';
-import { buildRtwTickPositions, selectLocalRtwPacket } from '../www/views/realtime.js';
+import {
+  applyPeakHold,
+  applyRealtimeBarBallistics,
+  buildRtwTickPositions,
+  selectLocalRtwPacket,
+} from '../www/views/realtime.js';
 
 const source = fs.readFileSync(new URL('../www/core/audio.js', import.meta.url), 'utf8');
 const configSource = fs.readFileSync(new URL('../www/core/config.js', import.meta.url), 'utf8');
@@ -118,4 +123,33 @@ for (const mode of ['1_3', '1_6', '1_12']) {
   }
 }
 
+const range = { bottom: -36, top: 9 };
+const peakNow = performance.now();
+const peakState = {
+  peakHold: new Float32Array([8]),
+  lastPeakTime: [peakNow - 3000],
+  holdSampleTs: peakNow - (1000 / 60),
+};
+const repeatedPeakAnchor = new Float32Array([-36]);
+const peakAfterOneFrame = applyPeakHold(peakState, repeatedPeakAnchor, {
+  RTA_PEAK_HOLD_MODE: 'fall',
+  RTA_PEAK_HOLD_SEC: 2.5,
+  RTA_PEAK_DECAY_DB_PER_S: 20,
+}, range)[0];
+assert.ok(peakAfterOneFrame < 7.8 && peakAfterOneFrame > 7.5,
+  `a repeated native peak anchor must still fall once per display frame, got ${peakAfterOneFrame}`);
+
+const barNow = performance.now();
+const barState = {
+  rtBarLevels: new Float32Array([8]),
+  rtBarPeakTimes: [barNow - 1000],
+  lastRtBarTs: barNow - (1000 / 60),
+};
+const barAfterOneFrame = applyRealtimeBarBallistics(barState, new Float32Array([-36]), {
+  REALTIME_BAR_HOLD_MS: 0,
+  REALTIME_BAR_DECAY_DB_PER_S: 20,
+}, range)[0];
+assert.ok(barAfterOneFrame < 7.8 && barAfterOneFrame > 7.5,
+  `a repeated native bar anchor must still fall once per display frame, got ${barAfterOneFrame}`);
+
 console.log('RTA profile regression tests passed');