v2: Initial clean branch with unit tests + CI/CD pipeline

- Started from ac75faa (initial E4B-MarkBase integration)
- Kept Sources/ (all engine code) + Package.swift + .gitignore
- Removed all ad-hoc tests, documentation, scripts, Python files
- Added Tests/00_Unit/ (MathTest, TokenizerTest, SamplerTest)
- Added .gitea/workflows/ci.yaml (build + unit tests + lint)
- Added Scripts/check_resources.sh (memory-aware test runner)
- Added Tests/Manifest.json (resource requirements for all tests)
- Focus: 4-bit quantized models only

Sources/MarkBase/Embedding/TextEmbeddingConfig.swift

@@ -0,0 +1,17 @@
+import Foundation
+
+public struct TextEmbeddingConfig: Codable, Sendable {
+    public var modelType: String
+    public var poolingMethod: PoolingMethod
+    public var normalize: Bool
+
+    public init(
+        modelType: String = "gemma-2b",
+        poolingMethod: PoolingMethod = .mean,
+        normalize: Bool = true
+    ) {
+        self.modelType = modelType
+        self.poolingMethod = poolingMethod
+        self.normalize = normalize
+    }
+}