zebra-spaces: dial the worklet stretch cap from ±8% to ±6%

Gentler pitch shift during buffer adaptation at the cost of slightly
longer ramp time:

- Shrink 4s→2s: ~25s → ~31s
- Grow 0.5s→4s: ~47s → ~61s

Pitch shift drops from ≤1 semitone to ≤0.7 semitone — less perceptible
on music. Fox 2026-06-05 dial.

web/zebra-spaces.html

@@ -1775,7 +1775,7 @@ const JITTER_BUFFER_WORKLET_CODE = `
  *  - buffered > target → stretchFactor < 1.0 (fast playback → buffer shrinks)
  *  - buffered ≈ target → stretchFactor = 1.0 (normal)
  *
- * Rate change is capped at ±8% and ramped smoothly per-block so the
+ * Rate change is capped at ±6% and ramped smoothly per-block so the
  * pitch shift during adaptation is ≤1 semitone, brief, and centred.
  * Listeners can disable stretching entirely via the 'lock_rate' command
  * so music never gets resampled.
@@ -1800,8 +1800,8 @@ class JitterBufferProcessor extends AudioWorkletProcessor {
     this.stretchFactor = 1.0;
     this.targetStretch = 1.0;
     this.stretchRampPerBlock = 0.0002;  /* ~0.075/sec ramp */
-    this.maxStretch = 1.08;             /* cap rate at ±8% */
-    this.minStretch = 0.92;
+    this.maxStretch = 1.06;             /* cap rate at ±6% */
+    this.minStretch = 0.94;
     this.bufferedReportEvery = 256;
     this.bufferedReportCounter = 0;
     this.queue = [];
@@ -1998,7 +1998,7 @@ function installJitterBuffer(uuid, node){
     };
     /* All roles now allow time-stretching — listeners benefit too
      * (their 4s cushion shrinks toward 2s when feed is clean, grows
-     * back to 4s on instability). The ±8% rate cap means the brief
+     * back to 4s on instability). The ±6% rate cap means the brief
      * pitch shift during adaptation is ≤1 semitone — barely audible
      * on speech, briefly audible on sustained music tones. Fox
      * 2026-06-05: "the 4 sec delay doesn't get faster with a better
@@ -2160,7 +2160,7 @@ async function refreshLipSyncForUuid(uuid){
  * is hitting the listener with loss/jitter, we GROW the worklet's
  * target buffer depth from DD_BASE_TARGET (0.5s, conversational) up
  * toward DD_MAX_TARGET (4s, full wiggle cushion). The worklet's
- * built-in adaptive resampling (±8% rate cap) slowly stretches
+ * built-in adaptive resampling (±6% rate cap) slowly stretches
  * playback to grow the actual buffer toward the new target without
  * audible click or gap — pitch shifts by ≤1 semitone during the
  * adaptation, returns to normal once the target is reached.
@@ -2601,7 +2601,7 @@ const RECV_PLAYOUT_DELAY_SEC = 4.0;
  * latency, then the Double Dragon adaptive controller grows it to
  * DD_MAX_TARGET_SEC (4s) when the publisher's network or encoder
  * shows instability and shrinks it back to DD_BASE_TARGET_SEC (0.5s)
- * during sustained clean periods. The worklet's ±8% rate-limited
+ * during sustained clean periods. The worklet's ±6% rate-limited
  * resampling makes the transition smooth: brief ≤1 semitone pitch
  * shift during the ramp, silence-free, click-free. */
 const SPEAKER_PLAYOUT_DELAY_SEC = 0.5;
@@ -6798,8 +6798,8 @@ logLine('', 'ready — pick a handle, type a rendezvous code, enter the space');
 
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