Plumbs the two programmatic-only hoister knobs from
`pnpm-workspace.yaml` through to the slice 4 walker and the slice 3
hoister. Both fields already existed on `HoistOpts`; this slice wires
them end-to-end.
- `Config::hoisting_limits: BTreeMap<String, BTreeSet<String>>` —
per-importer block-list, locator-keyed (`'.@'` for the root). Reads
`hoistingLimits: { ".@": [foo, bar] }` from yaml. Mirrors upstream's
https://github.com/pnpm/pnpm/blob/94240bc046/installing/linking/real-hoist/src/index.ts#L10
programmatic-only knob, exposed as yaml for parity since the
ergonomics of the locator-keyed map don't translate to a CLI flag.
- `Config::external_dependencies: BTreeSet<String>` — name slots
reserved at the root for an external linker (the Bit CLI is the
only known consumer upstream). Reads `externalDependencies: [...]`
from yaml.
- `LockfileToHoistedDepGraphOptions` gains both fields and forwards
them to `HoistOpts` in `build_dep_graph`.
- `InstallFrozenLockfile::run` clones the two `Config` fields into the
walker opts.
Both knobs default to empty (no limits, no externals), matching
upstream's default. Neither has any effect under `nodeLinker:
isolated` — the isolated linker keeps per-importer subtrees by
construction and doesn't consult the hoister.
Tests:
- `parses_hoisting_limits_from_yaml_and_applies` — yaml round-trip +
apply_to.
- `parses_external_dependencies_from_yaml_and_applies` — same.
- `omitting_hoisting_limits_and_external_dependencies_keeps_defaults`
— pins the apply_to skip-on-None branch so a yaml without these
keys doesn't accidentally overwrite Config defaults.
- `walker_forwards_external_dependencies_to_hoister` — end-to-end:
the walker observes an empty graph for an externalised alias
because the hoister stripped it. Pins the slice 10 plumbing.
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