Add XCUITest authoring docs and reusable prompt template

Tests iOS/README.md

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+# Tests iOS README
+
+## Purpose
+
+`Tests iOS/` contains XCTest-based UI tests for the iOS app.
+
+## Start Here Before Adding Tests
+
+1. Read `/Users/treyt/Desktop/code/Feels/docs/XCUITest-Authoring.md`.
+2. Reuse `BaseUITestCase` and helpers in `Helpers/`.
+3. Reuse screen objects in `Screens/` before writing inline query logic.
+
+## Required Pattern
+
+- Test class inherits `BaseUITestCase`.
+- Selectors use `UITestID` / accessibility identifiers first.
+- Waiting/tapping uses helper methods (`tapWhenReady`, `waitForDisappearance`, etc).
+- New app interactions get IDs in `/Users/treyt/Desktop/code/Feels/Shared/AccessibilityIdentifiers.swift`.
+
+## Anti-Patterns
+
+- `sleep(...)`
+- Selector logic based only on localized labels
+- Duplicating navigation logic instead of using `Screens/*`
+
+## Useful Paths
+
+- `/Users/treyt/Desktop/code/Feels/Tests iOS/Helpers/BaseUITestCase.swift`
+- `/Users/treyt/Desktop/code/Feels/Tests iOS/Helpers/WaitHelpers.swift`
+- `/Users/treyt/Desktop/code/Feels/docs/templates/XCUITestSuiteTemplate.swift`