shipper-core 0.3.0-rc.2

Core library behind the `shipper` CLI: engine, planning, state, registry, and remediation primitives for `cargo publish` workspaces.
Documentation 
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# Module: `crate::plan::chunking`

**Layer:** plan (layer 4)
**Single responsibility:** Split a large publish plan into smaller chunks for resumable mid-flight execution.
**Was:** standalone crate `shipper-chunking` (absorbed in this PR)

## Public-to-crate API

- `pub(crate) fn chunk_by_max_concurrent<T: Clone>(items: &[T], max_concurrent: usize) -> Vec<Vec<T>>`