fix(17): IN-02 document hand-maintained favicon.ico coupling

apps/pwa/scripts/copy-pwa-icons.mjs

@@ -9,6 +9,12 @@
  * chain so Windows contributors and minimal CI containers can run `pwa:icons`.
  *
  * Keep COPIES in sync with the manifest `icons` array in vite.config.ts.
+ *
+ * NOTE (IN-02): public/favicon.ico is NOT produced by this script — the
+ * minimal2023Preset does not emit a .ico. It is hand-maintained and committed
+ * directly in public/, and referenced by index.html (`<link rel="icon"
+ * href="/favicon.ico">`). When the brand mark changes, regenerate favicon.ico
+ * manually so it does not go stale relative to the SVG/PNG outputs below.
  */
 import { copyFileSync, existsSync } from 'node:fs';
 import { fileURLToPath } from 'node:url';