feat: add mcpplibs-xpkg package (libxpkg 0.0.1)

Add the xpkg package specification C++23 reference implementation
to the mcpplibs index with package definition, smoke test, and CI.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Sunrisepeak

.github/workflows/ci.yml

@@ -25,6 +25,7 @@ jobs:
       cmdline: ${{ steps.filter.outputs.cmdline }}
       llmapi: ${{ steps.filter.outputs.llmapi }}
       lua: ${{ steps.filter.outputs.lua }}
+      xpkg: ${{ steps.filter.outputs.xpkg }}
     steps:
       - uses: actions/checkout@v4
       - uses: dorny/paths-filter@v3
@@ -47,14 +48,19 @@ jobs:
               - 'packages/m/mcpplibs-capi-lua/**'
               - 'tests/l/lua/**'
               - '.github/workflows/ci.yml'
+            xpkg:
+              - 'packages/m/mcpplibs-xpkg/**'
+              - 'tests/m/mcpplibs-xpkg/**'
+              - '.github/workflows/ci.yml'
 
   build:
     needs: detect-changes
     if: >-
       needs.detect-changes.outputs.templates == 'true' ||
       needs.detect-changes.outputs.cmdline == 'true' ||
       needs.detect-changes.outputs.llmapi == 'true' ||
-      needs.detect-changes.outputs.lua == 'true'
+      needs.detect-changes.outputs.lua == 'true' ||
+      needs.detect-changes.outputs.xpkg == 'true'
     strategy:
       fail-fast: false
       matrix:
@@ -150,3 +156,19 @@ jobs:
           $env:PATH = "$env:USERPROFILE\.xlings\subos\current\bin;$env:PATH"
           xmake build -P . -y lua_test
           xmake run -P . lua_test
+
+      # mcpplibs-xpkg
+      - name: mcpplibs-xpkg (unix)
+        if: runner.os != 'Windows' && needs.detect-changes.outputs.xpkg == 'true'
+        working-directory: tests
+        run: |
+          export PATH="$HOME/.xlings/subos/current/bin:$PATH"
+          xmake build -P . -y mcpplibs-xpkg_test
+          xmake run -P . mcpplibs-xpkg_test
+      - name: mcpplibs-xpkg (windows)
+        if: runner.os == 'Windows' && needs.detect-changes.outputs.xpkg == 'true'
+        working-directory: tests
+        run: |
+          $env:PATH = "$env:USERPROFILE\.xlings\subos\current\bin;$env:PATH"
+          xmake build -P . -y mcpplibs-xpkg_test
+          xmake run -P . mcpplibs-xpkg_test

packages/m/mcpplibs-xpkg/xmake.lua

@@ -0,0 +1,19 @@
+package("mcpplibs-xpkg")
+
+    set_homepage("https://github.com/Sunrisepeak/libxpkg")
+    set_description("C++23 reference implementation of the xpkg package specification")
+    set_license("MIT")
+
+    add_urls(
+        "https://github.com/Sunrisepeak/libxpkg/archive/refs/tags/$(version).tar.gz",
+        "https://github.com/Sunrisepeak/libxpkg.git"
+    )
+
+    add_versions("0.0.1", "4bbf178c9225e6be09302408ebe70edfdae237adbf142ddf10d1535aec2ae0cd")
+
+    add_deps("mcpplibs-capi-lua")
+
+    on_install(function (package)
+        local configs = {}
+        import("package.tools.xmake").install(package, configs, {target = "xpkg"})
+    end)

tests/m/mcpplibs-xpkg/main.cpp

@@ -0,0 +1,10 @@
+import std;
+import mcpplibs.xpkg;
+
+int main() {
+    mcpplibs::xpkg::Package pkg;
+    pkg.name = "test";
+    pkg.description = "mcpplibs-xpkg smoke test";
+    std::println("package: {} - {}", pkg.name, pkg.description);
+    return 0;
+}

tests/m/mcpplibs-xpkg/xmake.lua

@@ -0,0 +1,8 @@
+add_requires("mcpplibs-xpkg 0.0.1")
+
+target("mcpplibs-xpkg_test")
+    set_kind("binary")
+    set_languages("c++23")
+    add_files("main.cpp")
+    add_packages("mcpplibs-xpkg")
+    set_policy("build.c++.modules", true)

tests/xmake.lua

@@ -4,3 +4,4 @@ includes("l/llmapi")
 includes("l/lua")
 includes("c/cmdline")
 includes("t/templates")
+includes("m/mcpplibs-xpkg")