[hSATAC]

Why

The worker printed every build log record and its own job-error records to its stdout unmasked: the build logger was a child of the default logger and inherited bunyan's stdout stream. The uploaded log already went through the secrets filter; stdout did not.

Remaining part of #4634. Closes ENG-28628.

How

• Move the job's mask list to module scope and give the default logger a masking stream to stdout.
• Build the build logger with its own masking stream instead of defaultLogger.child(), with the uploads piped from it.
• Serialize object fields even with no secret registered, so a circular field cannot stall the stdout stream.
• Delete the ws.ts debug record that logged the whole launcher message, job.secrets included.

Test Plan

Added worker unit coverage for masked build and worker records on stdout, a stalled stdout not blocking the uploads, circular and deep values without secrets, and the copied log level. Also ran lint, format check, TypeScript checks, and the changeset validator.

[linear-code]

ENG-28628

[hSATAC]

Stdout now uses the same format as the uploaded logs: same logId, no hostname. Since stdout stays on the host, I kept the format consistent across all three outputs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.99%. Comparing base (08c92bf) to head (31c2144).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4782      +/-   ##
==========================================
+ Coverage   75.96%   75.99%   +0.04%     
==========================================
  Files        1064     1064              
  Lines       52961    52979      +18     
  Branches    11590    11598       +8     
==========================================
+ Hits        40224    40254      +30     
+ Misses      11768    11758      -10     
+ Partials      969      967       -2     

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[github-actions]

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