Add XCUITest authoring docs and reusable prompt template

docs/XCUITest-Authoring.md

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+# XCUITest Authoring Guide
+
+This document defines the required pattern for writing or modifying UI tests in this repository.
+
+If a prompt says "create a UI test that does X", follow this guide exactly.
+
+## Foundation Map
+
+- Base class: `/Users/treyt/Desktop/code/Feels/Tests iOS/Helpers/BaseUITestCase.swift`
+- Wait + ID helpers: `/Users/treyt/Desktop/code/Feels/Tests iOS/Helpers/WaitHelpers.swift`
+- Screen objects: `/Users/treyt/Desktop/code/Feels/Tests iOS/Screens/`
+- Accessibility IDs source: `/Users/treyt/Desktop/code/Feels/Shared/AccessibilityIdentifiers.swift`
+- Test-mode launch and fixtures: `/Users/treyt/Desktop/code/Feels/Shared/UITestMode.swift`
+
+## Non-Negotiable Rules
+
+- Use `BaseUITestCase` for UI test suites.
+- Use `UITestID` / accessibility identifiers as primary selectors.
+- Use screen objects for navigation/actions/assertions.
+- Use wait helpers (`waitForExistence`, `waitForDisappearance`, `tapWhenReady`).
+- Do not use `sleep(...)`.
+- Do not rely on localized labels as the only selector.
+
+## Deterministic Setup
+
+Pick the right fixture by overriding `seedFixture` in the test class:
+
+- `"empty"`: no entries
+- `"single_mood"`: one current-day mood
+- `"week_of_moods"`: seven days of entries
+
+Override launch behavior when needed:
+
+- `skipOnboarding` (default `true`)
+- `bypassSubscription` (default `true`)
+- `expireTrial` (default `false`)
+
+## Authoring Workflow
+
+1. Define or confirm accessibility IDs in app code.
+2. Mirror IDs in `UITestID` if needed.
+3. Add/extend a screen object in `Tests iOS/Screens/`.
+4. Create a suite in `Tests iOS/{Feature}Tests.swift` inheriting `BaseUITestCase`.
+5. Keep tests focused on one behavior per test method.
+6. Add screenshots at meaningful checkpoints for triage.
+7. Run targeted suite first, then broader run if needed.
+
+## Command Pattern
+
+Targeted suite:
+
+```bash
+xcodebuild -project Feels.xcodeproj \
+  -scheme "Feels (iOS)" \
+  -destination 'platform=iOS Simulator,name=iPhone 16 Pro' \
+  -only-testing:"Tests iOS/<SuiteName>" \
+  test
+```
+
+Full iOS UI suite:
+
+```bash
+xcodebuild -project Feels.xcodeproj \
+  -scheme "Feels (iOS)" \
+  -destination 'platform=iOS Simulator,name=iPhone 16 Pro' \
+  -only-testing:"Tests iOS" \
+  test
+```
+
+## Definition Of Done For New UI Tests
+
+- New test compiles and passes in targeted run.
+- Selectors are identifier-first (not string-literal labels).
+- No `sleep(...)` usage.
+- Screen object methods are reused where applicable.
+- Any new test-only IDs are added in app code + test helper enums.
+
+## Prompt Contract (For Agents)
+
+When asked to "create a UI test that does X", the implementation should include:
+
+- Test suite + test method(s) in `Tests iOS/`
+- Any required accessibility ID additions in app code
+- Any required screen object additions
+- Targeted test execution output summary