Correct goniometer transport and correlation meter

scripts/test_goniometer.mjs

@@ -0,0 +1,31 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import vm from 'node:vm';
+
+const source = fs.readFileSync(new URL('../www/views/goniometer_rtw.js', import.meta.url), 'utf8');
+const functionSource = source.match(/export function resolveGoniometerPersistenceMs[\s\S]*?\n\}/)?.[0];
+assert.ok(functionSource, 'persistence resolver must remain testable');
+const context = vm.createContext({ Number, String, Math });
+vm.runInContext(functionSource.replace('export function', 'function'), context);
+
+assert.equal(context.resolveGoniometerPersistenceMs({ GONIO_PERSISTENCE_MODE: 'fast' }), 50);
+assert.equal(context.resolveGoniometerPersistenceMs({ GONIO_PERSISTENCE_MODE: 'medium' }), 150);
+assert.equal(context.resolveGoniometerPersistenceMs({ GONIO_PERSISTENCE_MODE: 'slow' }), 300);
+assert.equal(context.resolveGoniometerPersistenceMs({
+  GONIO_PERSISTENCE_MODE: 'custom',
+  GONIO_LINE_FADE_MS: 470,
+}), 470);
+assert.equal(context.resolveGoniometerPersistenceMs({
+  GONIO_PERSISTENCE_MODE: 'custom',
+  GONIO_LINE_FADE_MS: 900,
+}), 600);
+
+assert.match(source, /Math\.min\(targetPoints, total, MAX_TRACE_POINTS\)/,
+  'drawing must not upsample invented XY points');
+assert.match(source, /while \(trails\.length >= MAX_TRAIL_FRAMES\)/,
+  'trail history must remain bounded');
+assert.match(source, /pool\.pop\(\)/, 'trail buffers must be reused');
+assert.doesNotMatch(source, /utils\.correlation\(/,
+  'browser must not recalculate or smooth backend correlation');
+
+console.log('goniometer regression tests passed');

scripts/test_rta_profile.mjs

@@ -19,12 +19,18 @@ const forced = context.buildRtaRuntimeConfig({
   RTA_BPO_MODE: '1_12',
   RTA_FREQ_RANGE: 'lf',
   RTA_IIR_ORDER: 2,
+  CORR_RESPONSE_S: 2.5,
+  CORR_RESET_TOKEN: 7,
+  XY_POINTS: 256,
 });
 assert.equal(forced.engine, 'iir');
 assert.equal(forced.bpo, '1_3');
 assert.equal(forced.freqRange, 'norm');
 assert.equal(forced.order, 6);
 assert.equal(forced.rtwCenters.length, 31);
+assert.equal(forced.correlationResponseS, 2.5);
+assert.equal(forced.correlationResetToken, 7);
+assert.equal(forced.xyPoints, 256);
 
 const extension = context.buildRtaRuntimeConfig({
   RTA_BAR_LAYOUT: 'iec',