Fixes#11818
## Summary
`devEngines.runtime` / `engines.runtime` entries with `onFail: error` or `warn` silently did nothing — only `onFail: download` had any effect. This PR wires up validation for all three supported runtimes (node, deno, bun).
- Add `getSystemDenoVersion` / `getSystemBunVersion` and a generic `getSystemRuntimeVersion(name)` dispatcher in the runtime-version helper package.
- Walk each runtime entry in the manifest during pnpm startup, compare to the live system runtime, and throw `ERR_PNPM_BAD_RUNTIME_VERSION` (or warn) on a mismatch. Invalid ranges (e.g. `"invalid range"`) are reported instead of crashing `semver.minVersion`. Missing runtimes ("no Node.js on the system") get the same error path.
- The shell-out for deno/bun only runs when the manifest configures them AND `onFail` is `error`/`warn`. `download`/`ignore` short-circuit, and projects with no runtime pin pay nothing. Memoized per runtime.
- `pnpm --version`, `pnpm --help`, and `pnpm <cmd> --global` are exempt from the check.
- Rename `@pnpm/engine.runtime.system-node-version` → `@pnpm/engine.runtime.system-version` to match its broader scope; hoist `RuntimeName` / `RUNTIME_NAMES` / `isRuntimeAlias` to `@pnpm/types` so callers don't need to depend on `pkg-manifest.utils` just for the alias check.
## Tests
- `pnpm --filter pnpm run compile`
- `pnpm --filter pnpm exec jest packageManagerCheck.test` — 42 passing. New coverage: node/deno/bun version mismatch, invalid range, missing range, multi-entry runtime arrays, `engines.runtime` path (not just `devEngines.runtime`), and the `pnpm --version` exemption.
- `pnpm --filter @pnpm/engine.runtime.system-version test` — 10 passing, 100% statement coverage; unit tests for each helper and the dispatcher.
- Manual end-to-end smoke tests against the rebuilt bundle for deno and bun version mismatch.
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
## Release Notes
* **New Features**
* Added runtime version validation for Node.js, Deno, and Bun. The system now enforces `devEngines.runtime` and `engines.runtime` declarations with configurable failure behavior (`error`, `warn`, or `ignore`).
* Enhanced error messages for runtime version mismatches with helpful suggestions for overrides.
* **Improvements**
* Improved system runtime detection and version checking across multiple runtime environments.
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Co-authored-by: Puneet Dixit <236133619+puneetdixit200@users.noreply.github.com>
Co-authored-by: Zoltan Kochan <z@kochan.io>
