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Separate CCI parts JSON files into a dedicated `parts/` subdir. under the isolated output dir of each doc unit. The layout looks like: `<build-dir>/build/<pkg>-<hash>/out/parts/<crate>.json` This is a preparation of isolating per-crate doc HTML into a sibling `doc/` subdir.
Prepares for isolating per-crate rustdoc output, where the artifact doc directory may not yet exist on the first `cargo doc` invocation.
With `-Zrustdoc-mergeable-info`, each `rustdoc --merge=none` invocation now writes HTML to an isolated per-crate build directory instead of the shared `target/doc/`. At merge time, Cargo cleans the artifact doc dir, runs `--merge=finalize` to regenerate shared resources, then hardlinks per-crate HTML into `target/doc/`. This eliminates concurrent mutations to the shared artifact dir during parallel builds and enables future per-crate rebuild tracking.
This documents the current behavior
With `-Zrustdoc-mergeable-info`, per-crate rustdoc invocations only write to build dir. The exclusive artifact-dir lock is deferred to `merge_cross_crate_info()`. This allows concurrent `cargo doc` processes to run their per-crate rustdoc invocations in parallel and only serialize at the merge step.
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