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85b55dcf48
Ported from the web studio's 3d273a3, and folded into this branch's
colour-only rule for sims.
- `mono-high-contrast` joins BaseFilter, with its own matrix (a warm B&W
mix: red 0.38 / green 0.56 / blue 0.06, rows equal and summing to 1.00)
and its own FILM_TONE entry (toe -0.32, shoulder +0.26 — the whites step
of the brief). The sim ships with neutral adjustments like every other.
- The stock's own slope (+4 of Contrast) rides `STOCK_BIAS`, which absorbs
the former `STOCK_EXPOSURE` table: one place for tone a stock carries by
itself, keyed by baseFilter, so the EXPOSURE/CONTRAST sliders keep
reading 0 while the render is already pushed.
- Two B&W stocks now exist, so every "is this a colour stock?" test goes
through the new `isMonochromeBase` instead of comparing against
'monochrome' — a stray Kelvin gain on a grey ramp shows up as a tint.
The file is empty.