watchOS: host app + native XCUITests (re-enable UITests in AllTests)

[schatt]

Summary

SixLayerFrameworkUITests_watchOS excludes all *UITests.swift / XCUITestHelpers.swift and has no TestApp / TEST_TARGET_NAME. #354 omitted it from AllTests so an empty xctrunner is not mistaken for UI coverage.

This issue tracks the positive work: real watchOS UI coverage, with an itemized triage of what iOS UITests imply we still owe.

Goal

1. Add a watchOS XCUI host app (or equivalent).
2. Triage the candidate list below (port / unit-if-sufficient / N/A with docs+code checks / child issue).
3. Add watchOS-native XCUITests (not iOS-touch .tap() ports) where cheaper layers cannot observe.
4. Re-add SixLayerFrameworkUITests_watchOS to SLF-watchOS-AllTests only when non-empty and installable.
5. Update epic Run Full Test Suite for Every Platform #233 matrix UI cell for watchOS.

Candidate inventory (iOS UITest sources excluded on watchOS today)

• AccessibilityCompatibilityUITests.swift
• AccessibilityIdentifierCategoryAGlobalOffUITests.swift
• AccessibilityIdentifierCategoryAUITests.swift
• AccessibilityIdentifierCategoryEUITests.swift
• CallbackCategoryCUITests.swift
• FieldLayout385UITests.swift
• IntelligentDetailViewCategoryBUITests.swift
• Layer1AccessibilityUITests.swift
• Layer2AccessibilityUITests.swift
• Layer3AccessibilityUITests.swift
• Layer4UITests.swift
• Layer5UITests.swift
• Layer6UITests.swift
• ManualAccessibilityIdentifierHarnessUITests.swift
• OCRCategoryDUITests.swift
• PlatformAdvancedContainersAccessibilityUITests.swift
• PlatformStandaloneDropIn150UITests.swift
• PlatformToolbarAccessibilityUITests.swift
• SixLayerUITestNavigatorConsumerSmokeUITests.swift
• SixLayerUITestNavigatorUITests.swift
• XCUITestHelpers.swift

Out of scope

• First-class product/API expansion → epic Epic: First-class watchOS support #377
• Empty-runner omit (already done in [Epic #233] watchOS SLF-watchOS-AllTests: simulator bootstrap failure (esp. 27.0) #354)

Related

• [Epic #233] watchOS SLF-watchOS-AllTests: simulator bootstrap failure (esp. 27.0) #354 (omit empty runner)
• Epic Run Full Test Suite for Every Platform #233, Epic: First-class watchOS support #377
• visionOS sibling visionOS: host app + native XCUITests (re-enable UITests in AllTests) #392; honesty sweep Eliminate tautological Bool(true)/Bool(false) test expects #382

[schatt]

Process: Keep this inventory synchronized with project.yml excludes. Any new exclude (or re-include) of a listed file updates this checklist in the same batch — check off when ported, covered cheaper, or N/A; add rows when newly excluded.