vfs: resolve inherited worker entry after --import

[lazerg]

With --import, a worker that inherits --vfs-load only mounts the source after the preloads have run, but executeUserEntryPoint() resolved the worker's entry point before that. The lookup inside the mount found nothing, so the entry skipped the usual extension search and a worker like new Worker(path.join(__dirname, 'worker')) failed with ERR_MODULE_NOT_FOUND. This resolves the entry again once the mount is in place.

Written with AI assistance (Claude Code), reviewed and tested by me.

Refs: #66270

[nodejs-github-bot]

Review requested:

• @nodejs/loaders

[github-actions]

Caution

AgentScan found account activity patterns that may be consistent with automation. This is a heuristic, not proof that this pull request was opened by an agent or violates policy. AI-assisted contributions are permitted, but automated tooling must not open pull requests without advance approval, and contributors must personally understand, test, verify, and take responsibility for every submitted change. See the AgentScan analysis, AI use policy, and automation policy for additional context.

[lazerg]

y an agent or violates policy. AI-assisted contributions are permitted, but automated tooling must not open pull requests without advance approval, and contributors must personally understand, test, verify, and take responsibility for every submitted change. See the AgentScan analysis, AI use policy, and automation policy for additional context.

It is not full automation, i review, test myself

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.36%. Comparing base (9800c29) to head (5a95da1).
⚠️ Report is 145 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #66271      +/-   ##
==========================================
- Coverage   92.79%   90.36%   -2.44%     
==========================================
  Files         421      792     +371     
  Lines      191392   275569   +84177     
  Branches    29399    52835   +23436     
==========================================
+ Hits       177606   249023   +71417     
- Misses      13464    16964    +3500     
- Partials      322     9582    +9260     

Files with missing lines	Coverage Δ
lib/internal/modules/run_main.js	100.00% <100.00%> (+14.43%)	⬆️

... and 548 files with indirect coverage changes

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[pipobscure]

Note: #66140 gives --vfs-load mouted volumes a fixed layerId for that very reason and solves this issue as well.

[inoway46]

Could you change Fixes to Refs for #66270? As noted in my testing there, the reported worker.js case did not reproduce, while this PR addresses the extensionless worker case.

[lazerg]

@inoway46 thanks, switched it to Refs. the commit now also carries the Assisted-by trailer per AGENTS.md.