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

Package.swift

@@ -0,0 +1,50 @@
+// swift-tools-version: 6.0
+import PackageDescription
+
+let package = Package(
+    name: "MarkBase",
+    platforms: [.macOS(.v15)],
+    products: [
+        .library(name: "MarkBase", targets: ["MarkBase"]),
+        .executable(name: "MarkBaseServer", targets: ["MarkBaseServer"]),
+        .executable(name: "CLITest", targets: ["CLITest"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/hummingbird-project/hummingbird.git", from: "2.0.0"),
+        .package(path: "/Users/accusys/coder/poc/rdma"),
+    ],
+    targets: [
+        .target(
+            name: "MarkBase",
+            exclude: ["Metal/MetalKernels.metal", "Metal/OptimizedKernels.metal", "Metal/FusionKernels.metal", "Metal/MetalKernels.metallib", "Metal/metallib"],
+            linkerSettings: [
+                .linkedFramework("Metal"),
+                .linkedFramework("Foundation"),
+            ]
+        ),
+        .executableTarget(
+            name: "MarkBaseServer",
+            dependencies: [
+                "MarkBase",
+                .product(name: "Hummingbird", package: "hummingbird"),
+                .product(name: "RDMAKit", package: "rdma"),
+            ],
+            linkerSettings: [
+                .linkedFramework("Metal"),
+                .linkedFramework("Foundation"),
+            ]
+        ),
+        .executableTarget(
+            name: "CLITest",
+            dependencies: ["MarkBase"],
+            linkerSettings: [
+                .linkedFramework("Metal"),
+                .linkedFramework("Foundation"),
+            ]
+        ),
+        .testTarget(
+            name: "MarkBaseTests",
+            dependencies: ["MarkBase"]
+        ),
+    ]
+)