ci: fix JSR release smoke test

[witon-ai]

Summary

• run JSR source-package smoke checks with Deno, which supports JSR and npm specifiers natively
• pin the official Deno setup action
• let repair runs rebuild/upload the tarball and create or verify the matching GitHub Release

Root cause

The JSR npm compatibility package exposes TypeScript/TSX source and npm: specifiers, so a raw Node import fails even though publication succeeds.

Validation

• fresh-registry deno check for all three 0.1.1 entrypoints
• fresh-registry deno eval imports for all three 0.1.1 entrypoints
• pnpm release:test
• git diff --check