Felt Orbit ORHACK demo v22 - actual key-release fix

Base: v20 (confirmed working latch).

Important correction:
v21 changed the sample-end safety fade, NOT the key-up release.
The actual note-off path in samp_voice/pd env was:
  v $0-env -> [0 $1(
so release time was tied to the old Attack value and was extremely short.

v22 changes ONLY the real key-up release:
  [0 $1( -> [0 700(

Expected:
- Latch OFF: releasing the key gives a clearly audible ~700 ms decay.
- Latch ON: note-off is swallowed, so the sample continues naturally.
- Natural sample-end behavior is unchanged from v20.
- sample length / pitch / octave / latch logic untouched.
