The block-editor move/remove controls used :sx-disable "true" (the OLD relate-picker pattern
= plain POST → 303 → full reload). Switched to :sx-post + :sx-target #block-editor + :sx-swap
outerHTML (the current pattern): the click is a text/sx form round-trip through the WASM
engine, the handler returns the re-rendered #block-editor, and it swaps IN PLACE — no reload.
Added lib/host/playwright/{block-editor.spec.js, run-block-check.sh} (the run-picker-check
harness pattern: ephemeral host server + one editable post + the main worktree's chromium).
Verifies the irreducibly-browser behaviour the SX conformance can't see: adding, reordering
(↑), and removing blocks re-render #block-editor live, and the controls RE-BIND on the
content each swap brings in. PASSES (1/1, 16s). blog conformance still 165/165.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
