* feat(node): prioritize RAILPACK_NODE_VERSION over engines.node
- Add regression test case to verify environment variable precedence for Node version resolution.
- Add reproduction example for the reported issue where engine constraints override deployment variables.
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* feat(test): rename and update node version precedence example
* Rename `node-subfolder-node-version` to `node-version-precedence` to better reflect its purpose.
* Update `test.json` to allow stderr, accommodating potential output variations during version resolution.
* Replace the README to clarify the expected precedence behavior for environment variables versus engine settings.
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* refactor: improve package version resolution comments
- Clarify that package versions defined in `railpack.json` serve as defaults.
- Clarify that these values are overridden by more specific sources like `package.json` or environment variables.
- Update documentation to reflect that version sources are labeled as "custom config" to accommodate CLI flags and external config files.
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* feat(deps): add bun to idiomatic version resolution
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* refactor(mise): simplify version resolution logic
- Improve readability by removing nested conditional blocks.
- Clarify that UseMiseVersions now supports idiomatic version files and explicitly overwrites existing configuration.
- Enhance variable naming for better intent representation.
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* refactor(node): adjust node version resolution precedence
- Update node version resolution to ensure ENV-level configuration takes precedence over package.json engines.
- Refactor node detection logic for Bun projects to conditionally omit Node.js installation when no dependencies are present.
- Streamline Node.js package installation to reduce redundant configuration checks.
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* feat: add example test for Bun-only apps excluding Node binary
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* docs: simplify README for node version precedence example
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* test: add snapshots for node version precedence and bun examples
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* docs: update project documentation and test guidelines
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* refactor(test): merge node-bun-no-node into node-bun-no-deps
- Remove the redundant node-bun-no-node example.
- Consolidate the "no node binary" verification logic into the node-bun-no-deps example.
- Improve documentation in the readme for the consolidated example.
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* test: remove outdated snapshot for node-bun build plan
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