site 1.6.0 (local): four mods stable, the rest experimental; builder ticks all and warns

- Stable: extended BPM, boot text, LED animation, cue colours; every other mod
  experimental (main page, docs, builder).
- Builder: every mod ticked at the start; a red warning across the top: for
  home use, not for clubs or gigs.
- Intro: the emulator links to QEMU.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/changelog.json

@@ -1,6 +1,15 @@
 {
   "_about": "The site's changelog, newest first. Versions follow Semantic Versioning (MAJOR.MINOR.PATCH), dates ISO 8601 (DIN EN 28601). make_builder_data.py adds every mod's current version from its module and writes assets/versions.js.",
   "site": [
+    {
+      "version": "1.6.0",
+      "date": "2026-10-20",
+      "changes": [
+        "Stable are extended BPM, boot text, LED animation and cue colours; every other mod is experimental.",
+        "Builder: every mod ticked at the start, and a warning across the top: for home use, not for clubs or gigs.",
+        "The emulator in the intro links to QEMU."
+      ]
+    },
     {
       "version": "1.5.1",
       "date": "2026-10-20",