Add PlantGuide iOS app with plant identification and care management

- Implement camera capture and plant identification workflow
- Add Core Data persistence for plants, care schedules, and cached API data
- Create collection view with grid/list layouts and filtering
- Build plant detail views with care information display
- Integrate Trefle botanical API for plant care data
- Add local image storage for captured plant photos
- Implement dependency injection container for testability
- Include accessibility support throughout the app

Bug fixes in this commit:
- Fix Trefle API decoding by removing duplicate CodingKeys
- Fix LocalCachedImage to load from correct PlantImages directory
- Set dateAdded when saving plants for proper collection sorting

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

PlantGuideTests/Data/Repositories/InMemoryPlantRepositoryTests.swift

@@ -0,0 +1,43 @@
+//
+//  InMemoryPlantRepositoryTests.swift
+//  PlantGuideTests
+//
+//  Tests for InMemoryPlantRepository protocol conformance.
+//
+
+import XCTest
+@testable import PlantGuide
+
+final class InMemoryPlantRepositoryTests: XCTestCase {
+
+    // MARK: - Protocol Conformance Tests
+
+    func testConformsToPlantRepositoryProtocol() async {
+        // This test verifies at compile time that InMemoryPlantRepository
+        // conforms to PlantRepositoryProtocol
+        let repo: PlantRepositoryProtocol = InMemoryPlantRepository.shared
+        XCTAssertNotNil(repo)
+    }
+
+    func testConformsToPlantCollectionRepositoryProtocol() async {
+        let repo: PlantCollectionRepositoryProtocol = InMemoryPlantRepository.shared
+        XCTAssertNotNil(repo)
+    }
+
+    func testConformsToFavoritePlantRepositoryProtocol() async {
+        let repo: FavoritePlantRepositoryProtocol = InMemoryPlantRepository.shared
+        XCTAssertNotNil(repo)
+    }
+
+    // MARK: - Basic Operations Tests
+
+    func testFetchAllReturnsPlants() async throws {
+        let repo = InMemoryPlantRepository.shared
+        let plants = try await repo.fetchAll()
+
+        // In DEBUG mode, should have sample data seeded
+        #if DEBUG
+        XCTAssertFalse(plants.isEmpty, "Repository should have sample data in DEBUG mode")
+        #endif
+    }
+}