v0.2.4

lean-rs-host honors subDir for git dependencies when building the .olean search path

LakeProject::olean_search_paths enumerates each lake-manifest.json package into a .lake/build/lib/lean search-path
entry. It honored the dir field of path dependencies but ignored the subDir field that Lake records for a git
dependency declared with the subdirectory form (require «pkg» from git "url" @ "tag" / "sub"). Lake checks such a
package out to <packagesDir>/<name>/<subDir>, so dropping subDir pointed the search path at the repo root instead of
the package and the package's modules became unreachable (unknown module prefix '...' at import time). The enumeration
now appends subDir when present, so git-subdirectory dependencies resolve. This also fixes the same import failure when
the search path is built for an out-of-process worker, since the worker child resolves imports through the same
LakeProject enumeration.