Mocha to Node.js Test Runner

This migrates Mocha 8.x tests to Node.js (22.x, 24.x) test runner

Features

Automatically adds node:test imports/requires
Converts global describe, it, and hooks to imported versions
Transforms done callbacks to (t, done) signature
Converts this.skip() to t.skip()
Converts this.timeout(N) to { timeout: N } options
Preserves function styles (doesn't convert between function() and arrow functions)
Supports both CommonJS and ESM

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node:test doesn't support the retry option that Mocha has, so any tests using that will need to be handled separately.