chore: convert CLI run command to ESM

[macayu17]

PR Checklist

• Addresses an existing open issue: works on 🛠️ Repo: Convert remaining lib/cli/ files to ESM #5967
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Converts lib/cli/run.js to lib/cli/run.mjs as a small slice of the CLI ESM migration.

The run command now uses named exports for yargs (command, describe, builder, and handler), and commands.mjs re-exports it as the default run command namespace. I also updated the run command unit test to load run.mjs directly so this path stays covered.

I kept the other files from #5967 alone because they still have the require() / require.resolve() cases called out in the issue.

Checked with:

• npm run test-smoke
• npm run test-node:unit
• npm run tsc
• npm run clean; npm run build
• npx eslint --max-warnings 0 lib/cli/run.mjs lib/cli/commands.mjs test/node-unit/cli/run.spec.js
• npx prettier --check lib/cli/run.mjs lib/cli/commands.mjs test/node-unit/cli/run.spec.js

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: macayu17 / name: macayu17 (2eb1456)

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR migrates Mocha’s default CLI run command module toward ESM usage and updates command exports/tests accordingly.

Changes:

• Convert lib/cli/run.js from CommonJS (require/exports) to ESM (import/export).
• Update CLI command re-exports to reference an ESM run module.
• Add a unit test asserting the run command module is importable via ESM.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
test/node-unit/cli/run.spec.js	Updates the test import path and adds an ESM-module availability test for the run command.
lib/cli/run.js	Converts the run command implementation from CJS to ESM and updates imports/exports accordingly.
lib/cli/commands.mjs	Switches the default run command export to reference an ESM module.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.87%. Comparing base (6695fba) to head (fcc7c7c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6014      +/-   ##
==========================================
- Coverage   80.89%   80.87%   -0.03%     
==========================================
  Files          64       64              
  Lines        4602     4596       -6     
  Branches      976      975       -1     
==========================================
- Hits         3723     3717       -6     
  Misses        879      879              

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