updated CozmicC1ZZL3 for more user friendly behaviour

[soveda]

Summary

Updates the Workshop Computer 84_CosmikC1zzl3 release to the tested C1ZZL3 production 1.3 build.

• Promotes the latest hardware-tested UF2 with gate-held envelope looping and natural completion on gate/note release
• Updates firmware source to match the tested production build
• Updates Envelope Lab and C1ZZL3 Import Lab release web assets
• Updates release checksum, README, card guide, and Workshop metadata to describe production 1.3 behaviour

Pulse In 2 now behaves as a proper gate, not just a trigger.
Held Pulse In 2 or held MIDI note loops supported envelopes through their middle stages.
Releasing Pulse In 2 or sending MIDI note-off exits the loop.
After release, the envelope completes naturally from its current point instead of cutting off or jumping.
Short triggers now complete the full envelope.
Brass was reshaped so it sustains properly when held.
High-PD tones were smoothed to reduce harshness and excessive top end.
PD loudness compensation was added so volume does not rise as dramatically with increased PD.
Output low-pass was darkened slightly for a smoother overall tone.
High pitch plus high PD is softened by blending slightly back toward sine.