feat: load minimizers by module path in workers

[xiaoxiaojx]

Summary

• Allow minimizer.implementation as a module path string or { path, export } (sass-loader style). Default terser uses { path, export: "terserMinify" }.
• When every implementation in a task (including embedded) is a path, workers require via minify instead of serialize-javascript + new Function (transform). Inline minify functions keep the legacy path.
• Split helpers into implementation.js so the worker entry only exports minify / transform; unify loading through getMinimizerSlots / embeddedFromSlots.

Test plan

• yarn test (full suite)
• Confirm default parallel builds call worker.minify (not transform)
• Confirm minify: () => … / mixed path+function configs fall back to transform
• Smoke a yarn-linked webpack build / minimizer-handoff-unit bench against rebuilt dist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.44%. Comparing base (649b48d) to head (e50aeee).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #732      +/-   ##
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+ Coverage   95.27%   95.44%   +0.17%     
==========================================
  Files           4        5       +1     
  Lines        1354     1406      +52     
  Branches      503      529      +26     
==========================================
+ Hits         1290     1342      +52     
  Misses         56       56              
  Partials        8        8              

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