KateRTX OS · 5-STEP FULL DESKTOP (SDF exclusive · SPV · no host deps)
======================================================================

STEP 1 · SDF shell + scale
  CSS HTML JS desktop SPV · raised-SDF only chrome
  font-size ×2 · interface ×1.5
  file: css/shell.css · spvs/desktop.*

STEP 2 · Icon menu framework
  Standard icon grid · glyph images (hand-made, no gen scripts)
  click icon → SPV plug tab (plugin system)
  icons/: term kate mail essie ezzie secure field grin …

STEP 3 · SPV plugin system snappy
  desktop.js open() · manifest plugs · pack list
  antivirus + ESSIE + EZZIE + mail + term + kate as first-class

STEP 4 · Field + secure solo
  field bridge status in desk chrome
  AV as utility plug (not home) · BGL/pub in panel

STEP 5 · Fullscreen contained
  launch desktop SPV pack · no Firefox-first law
  engine optional for compute Field tab later

STEP 6 · Multi-seat + SDF bus (shipped)
  concurrent SPV seats per tab · hide/show not remount
  js/bus.js · BGS/BGF · insecure|secure|broadcast selectable
  designer headers = icons + launchers · headers.json
  ./bin/pack-os-desktop · docs/OS_TABBED_BUS.txt

LAW: SDF place exclusive UI · SPV free rides · ESSIE≠EZZIE · never ML · <3