fix(build): drop macosx from SUPPORTED_PLATFORMS (iOS-only app)

[torlando-tech]

Problem

After #88 fixes the missing-framework fetch, Xcode Cloud hits the next error:

While building for macOS, no library for this platform was found in …/Frameworks/Python.xcframework.

Root cause

The dual-backend merge (2e49820) widened SUPPORTED_PLATFORMS to "iphoneos iphonesimulator macosx" on every target — almost certainly an Xcode side effect of adding the sibling SPM packages (reticulum-swift, LXMF-swift, LXST-swift), which all declare .macOS(.v13).

But the embedded Python.xcframework (BeeWare Python-Apple-support) ships iOS-only slices — ios-arm64 and ios-arm64_x86_64-simulator, no macOS. So as soon as the build evaluates the macosx platform, it can't resolve a slice and fails.

All three native targets are iOS products with SDKROOT = iphoneos:

Target	Product type
ColumbaApp	application
ColumbaNetworkExtension	app-extension
ColumbaAppTests	unit-test

None is a genuine macOS target, so macosx is spurious.

Fix

SUPPORTED_PLATFORMS = "iphoneos iphonesimulator" across all 8 build configs (removes macosx). pbxproj lints clean.

SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD is unset and untouched — "iPhone/iPad Apps on Mac" uses the existing ios-arm64 slice, so that path is unaffected.

Order

Needs to land with #88 — #88 makes the framework present, this makes the build stop targeting a platform the framework doesn't support. Neither alone produces a green build.

Caveat (unchanged): once past this, the remaining suspect is the Xcode Cloud workflow's Xcode version — the Python clang module map needs Xcode 26 (the reason GitHub Actions is on macos-26). That's an App Store Connect setting, not in the repo.

[greptile-apps]

Greptile Summary

Drops macosx from SUPPORTED_PLATFORMS in all 8 build configurations across the ColumbaApp and ColumbaAppTests targets. This prevents Xcode Cloud from attempting to resolve a macOS xcframework slice that the BeeWare Python.xcframework (iOS-only: ios-arm64 + ios-arm64_x86_64-simulator) does not ship.

• 8 configs patched: Debug, Release, Debug-Swift, and Release-Swift for both ColumbaApp and ColumbaAppTests; ColumbaNetworkExtension never had an explicit SUPPORTED_PLATFORMS key and is unaffected.
• MACOSX_DEPLOYMENT_TARGET = 14.0 remains set in several configs — this key is benign when SDKROOT = iphoneos and macosx is absent from SUPPORTED_PLATFORMS; Xcode uses it for library compatibility checks and it does not cause a macOS build to be attempted.

Confidence Score: 5/5

Safe to merge — the change is a single-key removal across 8 build configs with no risk of unintended side effects.

The edit is surgical: every config that previously declared SUPPORTED_PLATFORMS with macosx has been corrected, ColumbaNetworkExtension never set the key and is properly inherited from the project level, and the residual MACOSX_DEPLOYMENT_TARGET keys are inert when SDKROOT = iphoneos is in force. There are no logic changes, no API changes, and no files outside the pbxproj are touched.

No files require special attention. Columba.xcodeproj/project.pbxproj is the only changed file and all 8 affected configs look correct.

Important Files Changed

Filename	Overview
Columba.xcodeproj/project.pbxproj	Removes macosx from SUPPORTED_PLATFORMS across all 8 build configs (ColumbaApp x4, ColumbaAppTests x4) that explicitly declared it, preventing Xcode from attempting to resolve a macOS slice that does not exist in the iOS-only Python.xcframework.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[Xcode Cloud build starts] --> B{Evaluate SUPPORTED_PLATFORMS}
    B --> OLD["Before: iphoneos iphonesimulator macosx"]
    B --> NEW["After: iphoneos iphonesimulator"]
    OLD --> C1[Resolve xcframework for iphoneos OK]
    OLD --> C2[Resolve xcframework for iphonesimulator OK]
    OLD --> C3[Resolve xcframework for macosx FAIL]
    C3 --> ERR["Build error: no library for this platform"]
    NEW --> D1[Resolve xcframework for iphoneos OK]
    NEW --> D2[Resolve xcframework for iphonesimulator OK]
    D1 & D2 --> SUCCESS[Build succeeds]

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_{Reviews (1): Last reviewed commit: "fix(build): drop macosx from SUPPORTED_P..." | Re-trigger Greptile}

[codecov]

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