giles 0da5dc41e1 Add Reactive Islands as top-level section in sx-docs ...

- New nav entry in ~sx-main-nav (layouts.sx)
- Nav items: Overview, Demo, Plan link (nav-data.sx)
- Overview page: architecture quadrant, four levels, signal primitives,
  island lifecycle, implementation status table with done/todo
- Demo page: annotated code examples for signal+computed+effect, batch,
  cleanup, computed chains, defisland, test suite
- defpage routes: /reactive-islands/ and /reactive-islands/<slug>

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-08 10:37:39 +00:00

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