Use packaged check-shorts directly

[Abse2001]

Summary

• remove runtime dynamic loading of @tscircuit/check-shorts
• statically import the checker functions used by tsci check shorts
• update the packaged checker from 0.0.12 to 0.0.19
• refresh the checker artifact snapshots for 0.0.19
• compare PNG snapshots by decoded pixels so compression differences do not make CI platform-dependent

Review addressed

The requested dynamic-loading implementation has been removed entirely. The CLI no longer fetches package metadata, downloads or installs a tarball, maintains a runtime cache, imports a file URL, or falls back between online and packaged modules. It now uses the packaged dependency directly.

Validation

• bun test tests/cli/check — 16 passed
• bun test tests/cli/check/check-shorts.test.ts — 3 passed
• bunx tsc --noEmit
• bun run format:check
• bun run build
• git diff --check

[seveibar]

Crazy, just remove the dynamic loading altogether