feat: initial CxLLM-SDK umbrella package

Phase 2 scaffold. Declares 11 library products that re-export upstream
sibling modules from cxai-studio.com/git/CxAI-Project/CxLLM-* packages.
Downstream apps depend on this single URL.

Products: CxCode, CxAWS, CxGit, CxAgent, CxMCP, CxModels, CxChat,
CxARA, CxSPARenderer, CxLangBridge, CxInstrument.

.gitignore

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+.build/
+.swiftpm/
+Package.resolved
+*.xcodeproj/xcuserdata/
+*.xcworkspace/xcuserdata/
+DerivedData/
+.DS_Store

CHANGELOG.md

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+# Changelog
+
+## 0.1.0 — initial scaffold (Phase 2)
+- Umbrella package with 11 library products re-exporting CxLLM-* siblings.

LICENSE

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+Proprietary — (c) CxAI Project. All rights reserved.

Package.swift

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+// swift-tools-version: 5.9
+// CxLLM-SDK — umbrella package that re-exports the CxLLM-* siblings.
+//
+// Downstream apps (CxLLM-IOS, CxWebApp/swift-app, third parties) depend on
+// this single URL and import any combination of: CxCode, CxAWS, CxGit,
+// CxAgent, CxMCP, CxModels, CxChat, CxARA, CxSPARenderer, CxLangBridge,
+// CxInstrument.
+//
+// Each umbrella product is a thin target that does `@_exported import` of
+// the upstream sibling module(s). This lets us reshape the sibling layout
+// later without breaking downstream imports.
+
+import PackageDescription
+
+let package = Package(
+    name: "CxLLM-SDK",
+    platforms: [.macOS(.v13), .iOS(.v17)],
+    products: [
+        .library(name: "CxCode",        targets: ["CxCode"]),
+        .library(name: "CxAWS",         targets: ["CxAWS"]),
+        .library(name: "CxGit",         targets: ["CxGit"]),
+        .library(name: "CxAgent",       targets: ["CxAgent"]),
+        .library(name: "CxMCP",         targets: ["CxMCP"]),
+        .library(name: "CxModels",      targets: ["CxModels"]),
+        .library(name: "CxChat",        targets: ["CxChat"]),
+        .library(name: "CxARA",         targets: ["CxARA_Re"]),
+        .library(name: "CxSPARenderer", targets: ["CxSPARenderer_Re"]),
+        .library(name: "CxLangBridge",  targets: ["CxLangBridge_Re"]),
+        .library(name: "CxInstrument",  targets: ["CxInstrument_Re"]),
+    ],
+    dependencies: [
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-Kernel.git",           branch: "main"),
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-LIB.git",              branch: "main"),
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-PLG.git",              branch: "main"),
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-Drive.git",            branch: "main"),
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-ARA.git",              branch: "main"),
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-SPA-RNDR.git",         branch: "main"),
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-LB-SDK.git",           branch: "main"),
+        .package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-INSTRUMENT-PCKG.git",  branch: "main"),
+    ],
+    targets: [
+        // CxCode = Kernel + Lib + Plugin
+        .target(name: "CxCode", dependencies: [
+            .product(name: "CxKernel", package: "CxLLM-Kernel"),
+            .product(name: "CxLib",    package: "CxLLM-LIB"),
+            .product(name: "CxPlugin", package: "CxLLM-PLG"),
+        ], path: "Sources/CxCode"),
+
+        // CxAWS, CxGit, CxDrive umbrella products all live in CxLLM-Drive
+        .target(name: "CxAWS", dependencies: [
+            .product(name: "CxAWS", package: "CxLLM-Drive"),
+        ], path: "Sources/CxAWS"),
+        .target(name: "CxGit", dependencies: [
+            .product(name: "CxGit", package: "CxLLM-Drive"),
+        ], path: "Sources/CxGit"),
+
+        // CxAgent / CxMCP / CxModels / CxChat are app-layer modules in CxLLM-IOS
+        // today. Phase 3 will move them into their own sibling packages; for now
+        // we expose seed targets here so downstream `import CxAgent` etc. compile.
+        .target(name: "CxAgent",  dependencies: [
+            .product(name: "CxLib", package: "CxLLM-LIB"),
+        ], path: "Sources/CxAgent"),
+        .target(name: "CxMCP",    dependencies: [
+            .product(name: "CxLib", package: "CxLLM-LIB"),
+        ], path: "Sources/CxMCP"),
+        .target(name: "CxModels", dependencies: [
+            .product(name: "CxLib", package: "CxLLM-LIB"),
+        ], path: "Sources/CxModels"),
+        .target(name: "CxChat",   dependencies: [
+            .product(name: "CxLib",    package: "CxLLM-LIB"),
+            .product(name: "CxKernel", package: "CxLLM-Kernel"),
+        ], path: "Sources/CxChat"),
+
+        // Pure re-export shims for siblings whose product name collides with
+        // an umbrella target name. The "_Re" target re-exports the sibling.
+        .target(name: "CxARA_Re", dependencies: [
+            .product(name: "CxARA", package: "CxLLM-ARA"),
+        ], path: "Sources/CxARA_Re"),
+        .target(name: "CxSPARenderer_Re", dependencies: [
+            .product(name: "CxSPARenderer", package: "CxLLM-SPA-RNDR"),
+        ], path: "Sources/CxSPARenderer_Re"),
+        .target(name: "CxLangBridge_Re", dependencies: [
+            .product(name: "CxLangBridge", package: "CxLLM-LB-SDK"),
+        ], path: "Sources/CxLangBridge_Re"),
+        .target(name: "CxInstrument_Re", dependencies: [
+            .product(name: "CxInstrument", package: "CxLLM-INSTRUMENT-PCKG"),
+        ], path: "Sources/CxInstrument_Re"),
+    ]
+)

README.md

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+# CxLLM-SDK
+
+Umbrella Swift Package for the CxLLM ecosystem. Downstream apps depend on
+this single URL and import any combination of `CxCode`, `CxAWS`, `CxGit`,
+`CxAgent`, `CxMCP`, `CxModels`, `CxChat`, `CxARA`, `CxSPARenderer`,
+`CxLangBridge`, `CxInstrument`.
+
+```swift
+.package(url: "https://cxai-studio.com/git/CxAI-Project/CxLLM-SDK.git", branch: "main")
+```
+
+Each umbrella product is a thin re-export shim of one or more upstream
+sibling packages (`CxLLM-Kernel`, `CxLLM-LIB`, `CxLLM-PLG`, `CxLLM-Drive`,
+`CxLLM-ARA`, `CxLLM-SPA-RNDR`, `CxLLM-LB-SDK`, `CxLLM-INSTRUMENT-PCKG`).
+This decouples the downstream import surface from the upstream package layout.
+
+Phase 0 status: seed implementations in upstream packages; real APIs land in
+Phase 3.

Sources/CxARA_Re/CxARA_Re.swift

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+// CxARA_Re — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxARA

Sources/CxAWS/CxAWS.swift

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+// CxAWS — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxAWS

Sources/CxAgent/CxAgent.swift

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+// CxAgent — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxLib

Sources/CxChat/CxChat.swift

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+// CxChat — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxLib
+@_exported import CxKernel

Sources/CxCode/CxCode.swift

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+// CxCode — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxKernel
+@_exported import CxLib
+@_exported import CxPlugin

Sources/CxGit/CxGit.swift

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+// CxGit — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxGit

Sources/CxInstrument_Re/CxInstrument_Re.swift

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+// CxInstrument_Re — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxInstrument

Sources/CxLangBridge_Re/CxLangBridge_Re.swift

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+// CxLangBridge_Re — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxLangBridge

Sources/CxMCP/CxMCP.swift

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+// CxMCP — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxLib

Sources/CxModels/CxModels.swift

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+// CxModels — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxLib

Sources/CxSPARenderer_Re/CxSPARenderer_Re.swift

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+// CxSPARenderer_Re — umbrella re-export shim. Auto-generated by Phase 2.
+@_exported import CxSPARenderer