chore: upgrade Node.js baseline to 22 (DEV-915)

[chriszhao1988]

Summary

• add explicit Node 22 runtime declarations for local development and package metadata
• upgrade GitHub test CI from Node 18 to Node 22
• keep the change surface limited to baseline alignment without touching package dependencies

Validation

• npm test
• eslint binary starts successfully under Node 22
• note: the repo's full lint command does not terminate promptly in this local environment and showed the same behavior before the change

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[chriszhao1988]

Final completion summary for DEV-915:

• Base branch is feature/1.0 because this repo does not have develop
• Added .nvmrc with 22.22.0
• Added top-level engines.node: >=22 <23 and engines.npm: >=10
• Updated GitHub test CI from Node 18 to Node 22
• Diff stays limited to baseline-alignment files only

Validation:

• npm test -> 11 suites passed, 23 tests passed
• eslint --version -> v7.32.0 under Node 22
• Full lint command did not terminate promptly in the local environment; no new Node 22-specific lint error was observed before interruption