[codeBelt]

The Solid adapter now targets Solid 2.0.0-rc.18 exclusively. Its public snapshot-accessor API stays the same, while synchronous notifications let Solid's own scheduler and flush() observe store updates correctly. Ordinary core subscriptions remain batched.

Require a live Solid owner before subscribing and stop delivery when that owner is disposed, including disposal during notification. Migrate the example and compiler tooling, add real browser regressions, and document the Solid 1 removal in a minor changeset for 0.9.0.

Validation:

• 560 unit tests passed.
• 136 browser tests passed across Chromium, Firefox, and WebKit, including all 18 Solid cases; 8 existing clipboard skips are expected.
• Original adapter failed the explicit-flush and owner-validation regressions.
• Library build, TypeScript checks, lint, Solid example production build, and CI Bun frozen-lockfile install passed.
• Packed-package Solid 2 browser smoke and Docusaurus production build passed.

Upgrade: pin solid-js to 2.0.0-rc.18; browser apps should also pin @solidjs/web to that version and use Solid 2 compiler tooling. Call useClassyStore() inside a component or live createRoot(). Solid 1 is no longer supported.