Add SkipFuse as explicit dependency for native app modules

[bookii]

Starting from Xcode 26, Swift Explicit Modules is enabled by default, requiring all imported modules to be declared as explicit dependencies.
(ref: https://developer.apple.com/documentation/xcode-release-notes/xcode-26-release-notes#Resolved-Issues)

The generated Package.swift for Skip Fuse mode now includes skip-fuse alongside skip-fuse-ui, fixing import SkipFuse failures.

Fixes skiptools/skip#662

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I used the issue I opened (skiptools/skip#662) to have Claude Code generate the fix, and verified it by running swift test.
However, it is difficult to perform a practical verification using skip create until this fix is merged into the main skip repository.

[cla-bot]

Thank you for your pull request and welcome to the Skip community. We require contributors to sign our contributor license agreement (CLA), and we don't seem to have the user(s) @bookii on file. In order for us to review and merge your code, for each noted user please add your GitHub username to Skip's .clabot file

[bookii]

Sorry, I mistakenly thought I had already signed the CLA.
Here is my signed PR:

• Add 'bookii' to approved GitHub usernames clabot-config#62

[marcprux]

Well that's annoying, and the first I've heard about this. Can you provide some information on the context in which you encountered this limitation? The skipapp-howdy Package.swift does not declare an explicit skip-fuse dependency, and ViewModel.swift is able to import SkipFuse.

Can you clarify under what circumstances this would break?

[marcprux]

Note that we do declare an explicit dependency when a multi-module project like skipapp-ahoy's Package.swift has a separate module (SkipperModel) that depends on SkipFuse. I don't recall if that was implemented for exactly this issue, or if it was for some other reason…

[bookii]

I just performed a clean install on this machine three days ago. Also, here is the output from skip doctor:

% skip doctor
Skip Doctor
[✓] Skip version 1.8.6 (= 1.8.6)
[✓] macOS version 26.4.1 (> 13.5.0)
[✓] macOS architecture: ARM
[✓] Swift version 6.3 (> 5.9.0)
[✓] Swiftly version 1.1.1 (> 1.0.0)
[✓] Xcode version 26.4 (> 15.0.0)
[✓] Xcode tools SDKs: 5
[✓] Homebrew version 5.1.5 (> 4.1.0)
[✓] Gradle version 9.4.1 (> 8.6.0)
[✓] Java version 25.0.2 (> 17.0.0)
[✓] Android Debug Bridge version 1.0.41 (> 1.0.40)
[✓] Android SDK version 37.0.0 (> 29.0.0)
[✓] Check Skip Updates: 1.8.6
[✓] Skip 1.8.6 doctor succeeded in 1.38s

I should also mention that running skip create again results in the same error. To be honest, I'm still not entirely sure where the root cause lies, so please let me know if you need any additional information.