* feat(node): add out-of-sync package-lock npm example
- Add new example demonstrating npm ci failure with an out-of-sync lockfile
- Include test configuration and documentation for the scenario
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* fix(node): fallback to npm install when lockfile is missing
- Always use `npm install` for npm projects to prevent build failures when `package-lock.json` is missing.
- Log a warning when the lockfile is absent to encourage generating one.
- Clean up outdated comments regarding package manifest parsing.
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* test(core): update test snapshots for npm install changes
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* feat(node): add npm ci recommendation and railpack example
- Document recommendations for preferring `npm ci` over `npm install` for Node.js projects using npm.
- Add a corresponding `railpack.json` example demonstrating how to configure deterministic installs with `npm ci`.
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* refactor(core): use npm ci in build plan for node npm examples
- Switch from `npm install` to `npm ci` for deterministic builds when package-lock.json is present.
- Remove redundant cache directory creation step.
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* feat(node): add suggestions for missing lockfiles
- Log suggestions when `package-lock.json` or `pnpm-lock.yaml` is missing to encourage deterministic installs.
- Update architecture documentation with guidance on committing `package-lock.json`.
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* test(core): update out-of-sync package-lock snapshot for builder changes
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* feat(node): allow overriding npm install command via config variable
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* docs(node): document RAILPACK_NODE_NPM_INSTALL environment variable
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* docs: recommend committing all package manager lockfiles
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