lookup: update thread-sleep metadata

[reggi]

Summary

Remove the stale native-build metadata from the thread-sleep lookup entry.

Why this is needed

CITGM currently installs the fixture with:

npm install --build-from-source

--build-from-source historically forwarded configuration to native installers. npm 12 rejects unknown CLI configuration flags, so the command now fails with EUNKNOWNCONFIG before installation or tests begin.

Current thread-sleep@2.2.0 releases are implemented entirely in JavaScript. The selected source contains no binding.gyp, native dependency, binary configuration, or install script. It executes a child Node.js process and uses setTimeout to provide synchronous sleeping behavior.

The source-build override and native tag are therefore leftovers from thread-sleep's older native implementation. Replacing the CLI flag with an environment variable would preserve behavior that the current fixture no longer has. This change removes both stale fields and lets CITGM perform a normal install before running the existing timing tests.

The fixture remains marked flaky because its timing assertions can still vary under load. This change does not alter that independent disposition.

Addresses npm/cli#10023.

Validation

• ./node_modules/.bin/eslint --cache
• ./node_modules/.bin/prettier --check lib/lookup.json
• ./node_modules/.bin/tap run test/test-lookup.js test/test-create-options.js
• jq empty lib/lookup.json
• git diff --check

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.20%. Comparing base (8914dd0) to head (bd103c9).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1159   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files          29       29           
  Lines        2213     2213           
=======================================
  Hits         2129     2129           
  Misses         84       84           

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