Add XCUITest authoring docs and reusable prompt template

AGENTS.md

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+# Feels Agent Instructions
+
+## XCUITest Workflows (Required)
+
+When a user asks to add or update iOS UI tests, follow this order:
+
+1. Read `/Users/treyt/Desktop/code/Feels/docs/XCUITest-Authoring.md`.
+2. Use the existing test foundation (`BaseUITestCase`, `WaitHelpers`, screen objects).
+3. Prefer adding/updating accessibility IDs in app code first, then consume those IDs in tests.
+4. Run the affected suite with `-only-testing` and report pass/fail.
+5. If behavior changes broadly, run the full `Tests iOS` suite.
+
+## Hard Rules For UI Tests
+
+- Do not use `sleep(...)`.
+- Do not use raw text selectors as the primary selector.
+- Use `UITestID` + screen objects from `Tests iOS/Screens/`.
+- Keep tests deterministic via fixtures and launch flags from `BaseUITestCase`.
+- Put new suites in `Tests iOS/` and name files `{Feature}Tests.swift`.
+
+## Primary References
+
+- Guide: `/Users/treyt/Desktop/code/Feels/docs/XCUITest-Authoring.md`
+- Template: `/Users/treyt/Desktop/code/Feels/docs/templates/XCUITestSuiteTemplate.swift`
+- Foundation helper: `/Users/treyt/Desktop/code/Feels/Tests iOS/Helpers/BaseUITestCase.swift`
+- Wait/ID helper: `/Users/treyt/Desktop/code/Feels/Tests iOS/Helpers/WaitHelpers.swift`