Multi-targeted iOS app heads (`net10.0;net10.0-ios`) are classified Neutral, so `ios build/package/upload` find no heads and exit green

[matt-edmondson]

Plan

docs/ios-support-plan.md L118–125:

handle multi-targeting (<TargetFrameworks>) by treating the project as iOS-capable if any TFM is an iOS TFM.

What exists today

• DotNetService.GetIosHeads (KtsuBuild/DotNet/DotNetService.cs around lines 407–412) requires GetProjectPlatform(p) == ProjectPlatform.Ios && IsExecutableProject(p).
• ClassifyTargetFrameworks (around lines 555–590) returns Neutral whenever any TFM is neutral. That rule is right for host gating and is pinned by GetProjectPlatform_MultiTargetWithNeutral_ReturnsNeutral, but it means an OutputType=Exe project with <TargetFrameworks>net10.0;net10.0-ios</TargetFrameworks> is never an iOS head.
• IosService.ResolveIosFramework already picks the iOS TFM out of a multi-target project (ResolveIosFramework_MultiTarget_PicksIosTfm). Packaging therefore expects these heads; only detection is missing.

Failure scenario

For a repository whose app head multi-targets desktop and iOS:

• ktsubuild ios build logs "No iOS heads found… Nothing to build" and exits 0.
• ci's iOS validation logs this at verbose level only.
• ios package and ios upload package and upload nothing, and the run still goes green.

What's missing and acceptance criteria

• Detect iOS heads as "executable and any TFM matches net\d+\.\d+-ios", separately from the host-gating ProjectPlatform classification. Leave host gating unchanged.
• BuildIosAsync passes -f <iosTfm>, reusing ResolveIosFramework, so a multi-target head isn't also built for net10.0 with an iOS RID.
• Tests:
  • GetIosHeads returns a net10.0;net10.0-ios Exe project.
  • GetProjectPlatform for that project stays Neutral.
  • The build arguments for it include -f net10.0-ios.

Dependencies

This touches the same detection code as #192 (heads whose TFM comes from ktsu.Sdk.iOS, and $(...) tokens). Coordinate the two, or fix them in the same PR.

[matt-edmondson]

Triage

• Category: Bug
• Priority: Medium. A multi-targeted app head is never detected as iOS, so ios build, ios package and ios upload do nothing and exit green. The failure is silent, but its reach is limited while few repositories ship iOS heads.
• Area / suggested assignment: DotNetService project classification (GetIosHeads, ClassifyTargetFrameworks) and IosBuildService (-f <iosTfm>)
• Duplicates: not a duplicate, but the same detection code as iOS heads that get their TFM from ktsu.Sdk.iOS are classified Neutral, so ios build and ci find no heads and non-macOS hosts try to build them #192 (heads whose TFM comes from ktsu.Sdk.iOS). Fix both in one PR, with a single "is iOS head" predicate kept separate from host gating.
• In progress: no matching open PR.

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