tselect-npm / countries

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:boom: Modernize the toolchain, and fix three bugs in the published package

Brings countries onto the scope's toolchain — pnpm, tsdown dual ESM+CJS, Vitest,
Biome, TypeScript 7, the org-wide reusable CI — and fixes three bugs found on the
way, two of them in the shipped public API.

The branch's gitmoji series, which the squash collapses:

  :bug:                 Ship only compiled JavaScript in the published package
  :wrench:              Migrate to pnpm
  :sparkles:            Add dual ESM + CJS build via tsdown, on TypeScript 7
  :bug:                 Drop lodash — the ESM entry threw on import
  :white_check_mark:    Migrate test suite to Vitest
  :bug:                 Key the language indexes by the enum member, not an uppercased one
  :bug:                 Resolve the macrolanguages, and stop leaking undefined into getLanguages()
  :white_check_mark:    Cover the rest of the API, to 100%
  :rotating_light:      Replace TSLint with Biome
  :memo:                Rewrite the README, and make its examples a test
  :construction_worker: Run CI and releases from the org-wide reusable workflows
  :wrench:              Declare engines.node >=22

Major four times over: engines.node >=22; the exports map closing deep imports;
ILanguage's four code getters returning different strings; and Countries.get(ME)
now throwing.

The three bugs, all present in the published 1.0.0:

  1. The ESM entry threw on import. lodash was used for one function, toPairs,
     via `import * as Lodash`, and the datasets are built at module scope — so
     `import '@tselect/countries'` died with `TypeError: Lodash.toPairs is not a
     function` before any consumer code ran. Object.entries replaces it; zero
     runtime dependencies now.

  2. Languages keyed its four indexes uppercase against lowercase enums, so all
     185 lookups by an enum member returned undefined, the getters returned
     values outside their declared types, and ICountry.hasLanguage() was
     structura... (continued)

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