"Native Xcode and Swift package compatibility fixes"

Pinned Swift package checkouts now reuse commits already present locally and fall back to a full fetch when a Git server rejects shallow clients. The xcodebuild wrapper accepts custom configuration names when they match the Once seed, including Development.

Native package lowering now honors linked libraries, frameworks, unsafe linker flags, and per-language warning policies. Manifest evaluation tracks a hash of the inherited environment so changes to manifest switches invalidate cached resolution without recording their values.

Discovery skips invalid local package templates with a warning. Resolver failures make once query targets and its MCP equivalent fail rather than present an incomplete graph as successful. Literal directory exclusions prune descendants, and nested targets validate workspace runtime sources correctly.

Swift package build-tool plugins now run during native builds, including source-built host tools, prebuild output discovery, generated resources, and commands that declare no outputs. Plugin failures fail the build. Plugin planning and execution run locally and bypass caching; native compilation remains cacheable. Xcode workspace fixtures exercise application builds, XCTest execution, environment changes, and regeneration after outputs are removed.