Adds hf-pitchshift alongside the four existing dynamics worklets: a dual-tap
granular delay line, 100 ms grain, taps 180° apart so one is always
crossfading in as the other resets — hides the splice each tap makes on
wrap. Read-tap speed relative to the write head tracks the semitone ratio,
so pitch shifts without changing duration.
Registered through the same workletBuilder/dispose-message path the other
four use (so shapeOf never rebuilds on a param tweak, and a chain drop
retires it), wired into the registry with a plain-language copy entry and a
~0.2s chain tail (two grains). One implementation, shared by preview (Web
Audio in the page) and render (the same worklet run inside an
OfflineAudioContext in the headless browser) — confirmed by a browser-render
test that measures the actual output frequency, not just that it differs
from input.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
