v0.53.0: Kaleidostrobe, the 2002 iTunes visualizer, as the fourth style

Reverse-engineered from its PowerPC binary and checked against the original
running under emulation: textures byte for byte and every triangle, over
3,600 frames. 25 fps like the plugin; its colour maps and wave images are
extracted from its own code; tests/kaleidostrobe_golden.npz was recorded
from the original.

scripts/kaleidostrobe/README.md

@@ -0,0 +1,21 @@
+# Kaleidostrobe reverse-engineering tools
+
+How `lintunes/kaleidostrobe/` was made, and how to check it again. Dev-only:
+needs `pip install capstone unicorn numpy` (never a LinTunes dependency) and
+the original bundle (`KALEIDOSTROBE_BIN`, default
+`~/documents/misc/lil hacky bits/Kaleidostrobe.bundle/Contents/MacOS/Kaleidostrobe`).
+
+- `macho.py` — Mach-O PPC parser + annotated disassembly
+  (`python macho.py _display _checkBeat`): resolves the PIC base, stubs,
+  non-lazy pointers and float constants.
+- `emu.py` — the original under Unicorn: imports answered in Python
+  (libm, Darwin `rand`, TickCount/Microseconds, Carbon's `pi`), GL calls
+  recorded. After adding a hook, `ctl_remove_cache` — Unicorn never applies
+  a hook to code it already translated.
+- `plugin.py` — drives `VisualPluginHandler` like iTunes: init, show, vply,
+  vrnd.
+- `extract.py OUT.npz` — the colour maps and base wave images
+  → `lintunes/kaleidostrobe/tables.npz`.
+- `golden.py OUT.npz` — `tests/kaleidostrobe_golden.npz`.
+- `compare.py [frames]`, `coverage.py` — the port against the original,
+  frame by frame / function by function.