analysis: diagnose tracking flicker and identify the 2.4.0 pin-style path

scripts/diagnose-tracking.sh

@@ -0,0 +1,14 @@
+#!/bin/zsh
+# Diagnostic statistics for authored inputs; a zero exit is not a stability pass.
+set -euo pipefail
+ROOT="$(cd "$(dirname "$0")/.." && pwd)"
+WORK="$ROOT/build/tracking-diagnostics"
+mkdir -p "$WORK"
+xcrun clang -fobjc-arc -fmodules -Wall -Wextra -Wno-unused-parameter \
+  -DCI_SILENCE_GL_DEPRECATION -mmacosx-version-min=13.0 \
+  -I "$ROOT/FCP-BeautyGirl/FCP-BeautyGirl/Plugin" \
+  -framework Foundation -framework CoreImage -framework CoreGraphics \
+  -framework CoreMedia -framework Metal -framework Vision -framework ImageIO \
+  "$ROOT/FCP-BeautyGirl/FCP-BeautyGirl/Plugin/PGFaceProcessor.m" \
+  "$ROOT/scripts/diagnose-tracking.m" -o "$WORK/tracking-probe"
+"$WORK/tracking-probe"