clean up js packaging / smoke test

[davidhewitt]

attempting to make the JS packaging pipeline assemble proper packages and smoke-test those before release

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Summary by cubic

Reworks JS packaging to assemble proper @pydantic/monty and platform packages, smoke-test the packed tarballs across OS/arch and Node 20/24, and ensure the WASM runtime ships in the main package. We now reuse runtime worker binaries from Python wheels and only build the N-API addon in the JS build.

• Refactors
  • Build only the N-API addon in CI; worker executables come from pydantic-monty-runtime wheels.
  • Add assemble-js-packages job to assemble, validate, and pack tarballs (includes WASM runtime).
  • Add test-js-packages matrix to install the tarballs and run a smoke test across OS/arch and Node 20/24.
  • Release publishes the tested tarballs and now depends on test-js-packages.
  • Replace bash smoke test with scripts/assemble-packages.mjs and smoke-test/package-smoke.mjs; remove Makefile smoke-test; rename artifacts from monty-bin-* to monty-addon-*.
  • Work around a maturin wheel duplication bug by selecting the CPython 3.10 runtime wheel when extracting the monty binary.

^{Written for commit 1c0a3ab. Summary will update on new commits.}

[cubic-dev-ai]

All reported issues were addressed across 6 files

<sub>Reply with feedback, questions, or to request a fix.

Re-trigger cubic</sub>

[github-actions]

Codecov Results 📊

✅ Patch coverage is 100.00%. Project has 40958 uncovered lines.
✅ Project coverage is 49.72%. Comparing base (base) to head (head).

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    49.64%    49.72%    +0.08%
==========================================
  Files          319       319         —
  Lines        81272     81458      +186
  Branches    172725    173094      +369
==========================================
+ Hits         40341     40500      +159
- Misses       40931     40958       +27
- Partials      3089      3099       +10

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Generated by Codecov Action

[codspeed-hq]

Merging this PR will not alter performance

✅ 26 untouched benchmarks
⏩ 16 skipped benchmarks¹

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_{Comparing dh/js-packaging (1c0a3ab) with main (dd5fc71)}

Footnotes

1. 16 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!