chore: re-enable commented-out eslint-plugin-n recommended rules

[bhuvan-somisetty]

Context

During the migration to flat ESLint config in #3581, some n plugin recommended rules that were previously commented out were removed rather than re-enabled.

The rules were commented out originally due to installation or compatibility issues at the time.

Goal

Investigate and fix the root cause that was preventing those n recommended rules from being enabled, then re-enable them as part of the flat config setup.

Related

• PR: chore(eslint): use canonical n/ prefix for eslint-plugin-n in flat config #3581