Replace two calibration nodes with a single smart LCSLoadData that
fingerprints VAE weights (sha256 of first decoder weight) and
auto-manages cached calibration files as data/lcs_{fingerprint}.safetensors.
Frontend JS syncs preset values into sliders on user interaction,
but headless runners (e.g. Lumi-Batcher) skip the frontend entirely.
When a preset is selected but all sliders are still at defaults,
execute() now applies the preset values server-side as a fallback.
The warm_dir was a unit vector (norm=1) but LCS chroma vectors have
norms ~40-46, so color_temperature=0.5 only shifted chroma by 1.2%.
Scale warm_dir by mean anchor chroma magnitude so the shift is
proportional. Slider range narrowed from ±2.0 to ±1.0 and preset
values adjusted accordingly (Warm=0.15, Cool=-0.15, Cinematic=0.05).
Selecting a preset now updates slider values in real-time via a
frontend JS extension, and users can tweak values after selecting.
Sliders are always visible (removed optional=True). Preset values
live only in JS (single source of truth); Python keeps just the
name list for the combo widget. Sync only fires on explicit user
dropdown interaction, preserving saved slider tweaks on workflow load.
Float equality (!=) can fail after JS→JSON→Python round-trips on
slider values. Switch to epsilon-based _is_default_tone() helper.
Also precompute the warm/cool direction vector once at closure-build
time instead of recomputing it on every denoising step.
The node now controls contrast, brightness, saturation, and color
temperature — "Contrast Adjust" was misleading. Adds 9 one-click
tonal presets (Cinematic, HDR, Vivid, Dramatic, Low Key, High Key,
Warm, Cool, Desaturated) plus Custom mode for manual slider control.
Shifts chroma along the warm (Red+Yellow) ↔ cool (Blue+Cyan) axis
via additive offset before saturation scaling, so saturation=0 still
yields grayscale. Warm direction is derived from chromatic projections
of the 6 hue anchors (stripping their lightness component).
l_scalar (lightness projection onto achromatic axis) can naturally
extend beyond [0,1] during denoising. Clamping destroys highlight/shadow
detail — directly contradicting the purpose of contrast adjustment.
Type I color intervention already operates without clamping LCS coords.
The no-op skip in execute() ensures default params have zero effect.
Operates directly in 3D LCS space by decomposing patches into lightness
(projection onto black→white achromatic axis) and chroma (perpendicular
residual). No HSL round-trip needed, making it faster than the color
intervention path.
facok