feat: add `--external-only` flag to `cargo chef prepare`#360

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josecelano wants to merge 8 commits into

LukeMathWalker:mainfrom

josecelano:359-external-only-flag

Commits on Jun 5, 2026

feat(example): add workspace-split-cache example demonstrating the third-party cache split problem
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feat: add --external-only flag to `cargo chef prepare`
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refactor: replace positional bool in Recipe::prepare with PrepareOptions struct
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docs: clarify that --external-only strips ALL path deps, not just intra-workspace
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fix(tests): sort manifests by path before comparing in stability test
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fix(tests): parse lockfile TOML to assert package names in lock file test
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Address Copilot round-2 review suggestions
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style: apply rustfmt to external_only.rs test bindings
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