ci: add pnpm tests for wasm32-wasip1 and wasm32-unknown-unknown targets

[Boshen]

Summary

• Enhanced CI to run full pnpm test suite on wasm32-wasip1 and wasm32-unknown-unknown targets
• Previously these jobs only ran cargo check, now they build NAPI bindings and run tests
• Matches the existing wasi job pattern (wasm32-wasip1-threads)

Test plan

• Updated CI workflow to add pnpm setup, build, and test steps for both targets
• Verify CI passes with WebAssembly builds and tests

🤖 Generated with Claude Code

[graphite-app]

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[codspeed-hq]

CodSpeed Performance Report

Merging #745 will not alter performance

_{Comparing ci/test-wasm-targets (8795316) with main (4eb1051)}

Summary

✅ 7 untouched
⏩ 2 skipped¹

Footnotes

1. 2 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.
✅ Project coverage is 95.09%. Comparing base (870f67e) to head (8795316).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #745      +/-   ##
==========================================
- Coverage   95.62%   95.09%   -0.54%     
==========================================
  Files          16       16              
  Lines        2951     2974      +23     
==========================================
+ Hits         2822     2828       +6     
- Misses        129      146      +17     

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