[Aschenbath]

Expose corepack/api so callers can validate package-manager specifications and resolve versions without spawning the CLI. The entry point provides getSupportedPackageManagers, parsePackageManagerSpec, and resolvePackageManager, with self-contained TypeScript declarations and documented behavior for tags, ranges, cached releases, custom URLs, environment variables, and errors.

Resolution reuses Corepack's existing engine and does not install or run package managers or update Last Known Good versions. Exact versions are returned without verifying release existence. A separate CommonJS bundle supports both require and ES module named imports.

Validation:

• New API regression tests cover input validation, hashes, tags, ranges, cache preference/bypass, disabled network access, custom registries/URLs, error propagation, and absence of cache writes.
• Published-entry tests exercise CommonJS, ES module imports, and TypeScript consumers in both module modes.
• TypeScript, repository-wide ESLint, build/bundle generation, and git diff --check pass.
• Actual npm pack --ignore-scripts tarball verified: API bundle and declarations included, no task artifacts; extracted package passes CommonJS, ES module, and TypeScript smoke checks.
• Full Vitest suite (NOCK_ENV=replay vitest run --maxWorkers=2 --retry=0): 10 test files passed, 193 tests passed, and 1 existing expected failure. A local preload isolates fixture proxy settings while preserving the live npm signing-key check; V8 caches are disabled.

Closes #326.

[aduh95]

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