Release 4.221.0

The icon system, audited end to end (plan L32 I1/I2; the owner, 11-12: "Broken icon. Improve the icons that exist, add more icons, and improve the icon system in general").

• No broken icon anywhere. scripts/icon-audit.js reads every OpenVibers repository's main and lists every icon name that does not resolve: fa-* classes, kit.icon('…'), glyphs.*('…'), and the icon: fields in NAVs, menus and manifests. A site can run it from the package (npx ov-icon-audit --root .) and fail CI on a miss; the audit found and this release fixes fa-shoe-prints, fa-calendar-check, fa-cloud-arrow-down, fa-magnifying-glass-chart, fa-magnifying-glass-dollar, fa-plug-circle-plus, fa-power-off and fa-receipt.
• kit.icon(name) draws every glyph in openvibe-shared/glyphs, not only the kit's own 86: the rest travel with kit.js as a generated block (scripts/build-kit-glyphs.js) and a test checks the block is current. compass, chip, gauge, layers, route, scale and flask no longer draw an empty <svg> through the kit.
• Nine new glyphs, each with a solid twin: binoculars, telescope, microscope, gpu, cpu, memory, joystick, wand and layers-plus; wand-magic-sparkles now draws the wand, and ram maps to memory. All are centred and sized to the set (checked by test/glyph-metrics, test/icon-ink), reviewed at 16/20/24 px in light and dark, and rebuilt into the sprite, CSS, web/desktop fonts and code points.
• Keywords for every glyph. glyphs.META[name].tags carries the Font Awesome names a glyph stands for plus its synonyms (for the icon pages and the suggest API), so every glyph has searchable words.