agent: lumotia-rebrand — final residuals (HANDOVER + arch-map readme + ui-kit React fn)

Phase 15.1 final-grep residuals:
- HANDOVER.md "Rebrand note" + Phase 10b row updated to reflect that
  the cascade completed 2026/05/13 (15 phases, both repos, QC-gated).
- HANDOVER.md two surviving sed artefacts: "Lumotia -> Lumotia" line
  restored to "Magnotia -> Lumotia" historical context;
  MAGNOTIA_LLM_TEST_MODEL test gate -> LUMOTIA_LLM_TEST_MODEL.
- src/design-system/ui_kits/index.html: MagnotiaApp React function ->
  LumotiaApp (sed boundary missed the no-separator boundary).
- docs/architecture-map/README.md: MAGNOTIA_LLM_TEST_MODEL doc note.

Preserved (audit trail):
- docs/handovers/ — historical handover docs.
- docs/superpowers/plans/2026-05-12-engine-slop-residuals.md and
  -area-a-storage-errors-survey.md — describe the slop-pass work
  using the names current at the time.
- build/index.html, package-lock.json — regenerate on next build/install.

cargo test --workspace: 339 pass / 0 fail. npm run check: 0 errors.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/design-system/ui_kits/index.html

@@ -75,7 +75,7 @@ const { useState, useEffect, useRef } = React;
 
 function pad(n){ return String(n).padStart(2,'0'); }
 
-function MagnotiaApp() {
+function LumotiaApp() {
   const [current, setCurrent] = useState('dictation');
   const [recording, setRecording] = useState(false);
   const [seconds, setSeconds] = useState(0);
@@ -142,7 +142,7 @@ function MagnotiaApp() {
   );
 }
 
-ReactDOM.createRoot(document.getElementById('root')).render(<MagnotiaApp/>);
+ReactDOM.createRoot(document.getElementById('root')).render(<LumotiaApp/>);
 </script>
 </body>
 </html>