Close the non-web-productionization gaps from the 2026-06-18 recheck:
- a11y (#67/#57): assemble each widget's access_node() into an
accesskit::TreeUpdate (op-editor-ui/accessibility.rs); publish on
desktop via accesskit_macos/_windows/_unix SubclassingAdapter off the
raw window handle (op-host-desktop/a11y.rs, NOT accesskit_winit — the
casement winit fork), and on web via a hidden ARIA DOM mirror
(op-host-web/a11y_dom.rs); native/web region enumeration + action
routing in op-host-{native,web}.
- single-instance (#51): fixed-loopback-port guard + second-launch file
forwarding to the running window (op-host-desktop/single_instance.rs).
- layer panel: drop-into-container inserts at index 0 (#12a); container
predicate widened to frame/group/rectangle/ref (#12b); Escape closes
the context menu on both hosts (#14).
- distribution: Homebrew cask fix + op formula + install-op.sh, README
CLI install, CI codesign/notarize/signtool scaffolding gated on secrets.
Codex-reviewed (1 BLOCKER + 3 CONCERNs resolved). main.rs, app_handler.rs,
canvaskit.rs and Cargo.lock are staged whole and carry some unrelated
in-progress WIP they're interleaved with.
