chore: modernise tooling — Node 24, remove chalk/fs-extra/globby/jest in favour of native Node APIs

[MattP007]

Summary

Removes all third-party utility dependencies that are now superseded by Node.js built-ins, and upgrades the project to Node 24.

Changes

Node upgrade

• Bumped .nvmrc to v24.14.1
• Updated engines.node to >=22
• Updated @types/node to 22.15.21

Removed ts-node

• Was listed as a dev dependency but never used directly in any script — removed.

Removed chalk

• Was listed as a runtime dependency but never imported anywhere in source — removed.
• util.styleText (available natively in Node 22+) is available as a replacement when needed.

Replaced fs-extra + globby with node:fs/promises

• fs.readFile / fs.writeFile → named imports from node:fs/promises
• glob() → native node:fs/promises glob async iterator with a small gitignore-aware exclude callback
• Removed @types/fs-extra dev dependency

Replaced jest + ts-jest with node:test

• All three test suites ported to node:test / node:assert/strict
• Module mocking via --experimental-test-module-mocks + mock.module()
• TypeScript run directly via --experimental-transform-types (needed for enum in source)
• Added scripts/ts-loader.mjs — a tiny ESM loader hook that rewrites .js → .ts for relative imports so source files keep .js extensions (correct for tsc NodeNext output) while still resolving at test time
• Added src/__tests__/helpers.ts with assertion utilities mirroring Jest's expect() matchers (assertCalledWith, stringContaining, objectContaining, etc.)
• Removed jest, ts-jest, @types/jest, jest.config.js
• Project converted to "type": "module" (ESM) + tsconfig updated to module: NodeNext

Result

• 62 tests, 62 pass, 0 fail
• Zero new runtime or dev dependencies added