Swift package guidance misclassifies .build/checkouts Xcode markers

[gaelic-ghost]

Summary

apple-dev-skills:sync-swift-package-guidance can misclassify a plain SwiftPM package as an ambiguous package/Xcode repo when dependency checkouts under .build/checkouts contain Xcode project or workspace markers.

Repro

From SwiftASB, a plain SwiftPM package rooted at /Users/galew/Workspace/gaelic-ghost/SwiftASB, run:

uv run /Users/galew/.codex/plugins/cache/socket/apple-dev-skills/6.0.6/skills/sync-swift-package-guidance/scripts/run_workflow.py --repo-root /Users/galew/Workspace/gaelic-ghost/SwiftASB

The runner reports:

{
  "is_ambiguous_repo": true,
  "is_package_repo": true,
  "is_xcode_repo": true,
  "package_manifest": "/Users/galew/Workspace/gaelic-ghost/SwiftASB/Package.swift",
  "project": "/Users/galew/Workspace/gaelic-ghost/SwiftASB/.build/checkouts/swift-collections/Xcode/Collections.xcodeproj",
  "workspace": "/Users/galew/Workspace/gaelic-ghost/SwiftASB/.build/checkouts/swift-collections/Utils/swift-collections.xcworkspace"
}

Expected behavior

Repo-root classification should ignore SwiftPM build artifacts and dependency checkouts under .build/, especially .build/checkouts/**, when deciding whether the requested root is an Xcode app/project repo.

For this repo, the expected classification is:

{
  "is_ambiguous_repo": false,
  "is_package_repo": true,
  "is_xcode_repo": false,
  "package_manifest": "/Users/galew/Workspace/gaelic-ghost/SwiftASB/Package.swift"
}

Why this matters

This blocks the normal sync-swift-package-guidance path in valid Swift packages after dependencies have been resolved. Contributors then have to fall back to manual guidance sync even though the package root itself is not ambiguous.

Suggested fix

Exclude at least these repo-local generated/dependency paths from Xcode marker detection:

• .build/**
• .swiftpm/** if it only contains package-manager generated state
• any other configured dependency/build-output directory used by SwiftPM

The detector should still catch real root-owned Xcode markers such as *.xcodeproj, *.xcworkspace, and package-adjacent project files outside generated dependency/build directories.

[gaelic-ghost]

Additional repro from SpeakSwiftly with plugin 6.0.7.

From /Users/galew/Workspace/gaelic-ghost/speak-swiftly/SpeakSwiftly, running:

uv run /Users/galew/.codex/plugins/cache/socket/apple-dev-skills/6.0.7/skills/sync-swift-package-guidance/scripts/run_workflow.py --repo-root . --dry-run

returned status: blocked with this detected state:

{
  "is_ambiguous_repo": true,
  "is_package_repo": true,
  "is_xcode_repo": true,
  "package_manifest": "/Users/galew/Workspace/gaelic-ghost/speak-swiftly/SpeakSwiftly/Package.swift",
  "project": "/Users/galew/Workspace/gaelic-ghost/speak-swiftly/SpeakSwiftly/.build/checkouts/mlx-audio-swift/Examples/VoicesApp/VoicesApp.xcodeproj",
  "workspace": "/Users/galew/Workspace/gaelic-ghost/speak-swiftly/SpeakSwiftly/.build/checkouts/mlx-audio-swift/Examples/VoicesApp/VoicesApp.xcodeproj/project.xcworkspace"
}

The requested root is still a plain SwiftPM package; the Xcode markers are inside a resolved dependency checkout under .build/checkouts. This confirms the bug is not specific to swift-collections or plugin 6.0.6.

[gaelic-ghost]

Fixed in socket v6.0.10 and apple-dev-skills v6.0.10. The detector now ignores generated SwiftPM state under .build and .swiftpm when classifying Xcode project/workspace markers, with regression coverage for the .build/checkouts repro.