Local path package is no longer recognized as an external dependency after Tuist 4.193.0

What happened?

A project that models a local Swift package through Tuist’s XcodeProj-based external dependency integration no longer generates after upgrading Tuist.

The Example project declares the local package in Example/Tuist/Package.swift:

.package(path: "../../")

and consumes its product in Example/Project.swift:

.external(name: "OpenAttributeGraph")

The same project generates successfully with Tuist 4.193.0. With both 4.202.5 and 4.203.0-rc.1, generation fails because OpenAttributeGraph is not recognized as a configured external dependency.

I expected the existing local external dependency configuration to continue generating, or for the required migration to be documented.

This may be related to #6272, but this reproduction runs tuist install and tuist generate from the same Example root that contains Tuist/Package.swift; it is also a version regression from 4.193.0.

A working workaround is to migrate the dependency to native local Swift package integration:

packages: [
    .package(path: ".."),
]

// Target dependency
.package(product: "OpenAttributeGraph")

The minimal migration diff is available in https://github.com/OpenSwiftUIProject/OpenAttributeGraph/pull/232.

How do we reproduce it?

The public OpenAttributeGraph repository can be used as the sample project:

1. Clone https://github.com/OpenSwiftUIProject/OpenAttributeGraph.
2. Check out commit 787779107f00a893b7de9937479dce03342d114f.
3. Change Example/mise.toml from Tuist 4.193.0 to 4.203.0-rc.1.
4. Run:

cd Example
mise trust mise.toml
mise install
mise exec -- tuist install
mise exec -- tuist generate --no-open

5. Observe the external dependency error.

Changing the pin back to 4.193.0 makes generation succeed. The failure also reproduces with 4.202.5.

Error log

`OpenAttributeGraph` is not a valid configured external dependency

macOS version

26.5.2

Tuist version

4.202.5 and 4.203.0-rc.1 (works with 4.193.0)

Xcode version

26.3 (17C529)

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