Short knob-grid labels for 2 parameter(s)

[charlesvestal]

Adds short_name to this module's parameters, so the Schwung knob grid can
label each cell with the word that identifies it rather than a squeezed
abbreviation of the full name.

Part of a fleet-wide pass over every catalogued module. Each name was chosen
by hand against the page it appears on: where a page is already called
"Filter Envelope", its cells say ATTACK and DECAY rather than F.ATK and FENVDEC.

What changes

• dissolver — 2 parameters labelled

Nothing else is touched: no version bump, no behaviour change, no new params.

dissolver — rendered

Left is what the grid draws today, right is with this change, across all 3 changed pages.

Before / after

page	key	grid drew	now draws
Main	mix	DRY/WE	MIX

The page matters where a name repeats: the same role under two sections
gets the same short name, and the section it sits under is what tells
them apart.

The full name is not lost

A short name is what the cell says at rest. The moment a knob is
touched, the header shows that parameter's full name and its value —
so nothing becomes unidentifiable, it just stops being shouted at you
eight times on one page.

mix on Main: the cell reads MIX at rest, and the header reads DRY/WET under the finger.

Safe to merge now

short_name is a new field — it lands in the next Schwung release. On the
currently released host (v0.12.1) it is simply ignored.

This was checked rather than assumed: for every file here, the v0.12.1
page planner was run against the module contract before and after the change
and asserted to produce byte-identical pages — same page count, same cells,
same order. Merging today changes nothing; the labels appear when users update.

Not included — these live in your DSP

10 more parameters take their metadata from the plugin's chain_params at runtime, so they
cannot be labelled from module.json. Adding short_name beside each one
in your chain_params JSON is all that is needed. Suggested values:

noise_mix  ->  NS MIX                         # Advanced
noise_tone  ->  NS TON                        # Advanced
stereo_width  ->  WIDTH                       # Advanced
grain_jitter  ->  COMP                        # Advanced
evo_depth  ->  DEPTH                          # Advanced
feedback_cap  ->  Cap                         # Advanced
tilt_freq  ->  TILT                           # Advanced
output_level  ->  OUT                         # Advanced
attack_time  ->  Attack                       # Advanced - 2
release_time  ->  Release                     # Advanced - 2

If a label is wrong

These are suggestions from someone reading the grid, not from the person who
wrote the synth. Change any of them in this branch, or close it — no hard
feelings either way. Layout problems are a separate matter and will come as
their own issues.