feat(theme-studio): add the live per-family count control

Each chromatic family column gets a count input (0-4) showing its current per-side reach. Setting N regenerates the family as a symmetric base ±N ramp from its most-saturated color, replacing the family's current members. A reference to a surviving step (matched by signed lightness rank) follows the new hex through repointHex; a reference to a step removed by lowering N is left on its old hex, which is no longer in the palette and renders as "(gone)" — never silently reassigned. The neutral and ground strips get no control.

I also fixed the neutral threshold curve: it was flat-high through the darks, which pulled a chroma-eased dark ramp step (a dark desaturated blue) into the neutral column and broke the family. The curve now tapers toward both lightness extremes, peaking near mid, so dark and light tints both keep their hue while mid grays stay neutral. This is the symmetric form of the Munsell scaling and a strict improvement.

Phase 4 of the color-families spec. A #counttest gate covers count-up adding symmetric steps, count-down dropping the extremes, the surviving-step repoint, and the removed-step "(gone)".

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/theme-studio/run-tests.sh b/scripts/theme-studio/run-tests.sh
index 7ae24ed7..00acf843 100755
--- a/scripts/theme-studio/run-tests.sh
+++ b/scripts/theme-studio/run-tests.sh
@@ -53,7 +53,7 @@ CHROME=""
 for c in google-chrome-stable google-chrome chromium chromium-browser; do
   if command -v "$c" >/dev/null 2>&1; then CHROME="$c"; break; fi
 done
-HASHES="selftest cursortest readouttest deltatest oklchtest planetest locktest sorttest mocktest ramptest contrasttest safetest healtest familytest"
+HASHES="selftest cursortest readouttest deltatest oklchtest planetest locktest sorttest mocktest ramptest contrasttest safetest healtest familytest counttest"
 if [ "$NO_BROWSER" = 1 ]; then
   skip_msg "browser hash gates (--no-browser)"
 elif [ -z "$CHROME" ]; then