ci(desktop): surface silent x86_64 build failures

[kodjima33]

Why

The omi-desktop-swift-release workflow's Build Swift app step had an existence check after the arm64 build but not after x86_64. If xcrun swift build --triple x86_64-apple-macosx exits 0 without producing the binary, the step silently "succeeds" and the next step (Create universal app bundle) fails with a generic "MISSING binary" message — no traceback to the real cause.

Burned Codemagic build 6a010cef → rebuild 6a011902 on v0.11.380. Same failure both times: Create universal app bundle fails in 0.6s; Build Swift app reports success in 601s, 33s shorter than the prior 634s success — strongly implying the x86_64 build was silently skipped.

What this changes

Add a symmetric existence check after the x86_64 build (mirroring the arm64 one). If x86_64 didn't produce output, exit early with a directory listing. The actual swift-build error (if any) remains visible in this step's stderr.

Test plan

• Merge to main → auto-release bumps to v0.11.381 → Codemagic runs.
• If x86_64 build is silently failing: the next attempt fails with a clear error pointing at the swift-build invocation (i.e. we'll then know what to fix in the code).
• If x86_64 builds fine and the universal-bundle step still fails: rules out my hypothesis and points elsewhere.

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

This PR adds a post-build existence check for the x86_64 Swift binary, mirroring the equivalent check that was already present for arm64. Previously, a silent x86_64 build failure (exit 0 but no output) would not be caught until the Create universal app bundle step, where a generic "missing binary" error obscured the root cause.

• Symmetric guard added: If Desktop/.build/x86_64-apple-macosx/release/$BINARY_NAME is absent after xcrun swift build --triple x86_64-apple-macosx, the step now exits immediately with diagnostic directory listings pointing directly at the swift-build invocation.
• Diagnostic output is slightly more detailed than the arm64 equivalent (uses ls -la with head -30), which is a net improvement for debuggability.

Confidence Score: 5/5

Safe to merge — the change is a targeted one-step guard that exits early with diagnostic output; it does not alter build logic, artifact paths, or downstream steps.

The addition mirrors an existing, proven pattern directly above it. Quoting is correct for the space-containing BINARY_NAME, || true prevents premature failure before the explicit exit 1, and the diagnostic listings give more information than their arm64 counterparts. No build logic is changed.

No files require special attention.

Important Files Changed

Filename	Overview
codemagic.yaml	Adds symmetric x86_64 binary existence check in the Build Swift app step, mirroring the pre-existing arm64 guard; diagnostics are well-formed and correctly quoted for the space-containing BINARY_NAME.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Build arm64\nxcrun swift build --triple arm64-apple-macosx] --> B{ARM64_PATH exists?}
    B -- No --> C[Print error + ls diagnostics\nexit 1]
    B -- Yes --> D[cp arm64 binary to /tmp/OmiComputer-arm64]
    D --> E[Build x86_64\nxcrun swift build --triple x86_64-apple-macosx]
    E --> F{X86_64_PATH exists?\n✅ NEW CHECK}
    F -- No --> G[Print error + ls -la diagnostics\nexit 1]
    F -- Yes --> H[Log arch info]
    H --> I[Create universal app bundle\nlipo -create arm64 x86_64]

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