What

When thread_system is consumed via find_package(common_system CONFIG) (the standard vcpkg path), ThreadSystemDependencies.cmake::find_common_system_dependency() successfully locates common_system but does not link the kcenon::common_system target to the ThreadSystem library. This causes downstream builds to fail with:

fatal error: 'kcenon/common/patterns/result.h' file not found

Why

• This is the single blocker preventing vcpkg overlay port builds for kcenon-thread-system (monitoring_system#282)
• Since thread_system is Tier 1, this cascades to all downstream libraries: logger_system, monitoring_system, network_system, and pacs_system
• The add_subdirectory() path works because it adds include directories directly, but the find_package() path (used by vcpkg) relies on proper target linkage

Where

• cmake/ThreadSystemDependencies.cmake — find_common_system_dependency() function
• cmake/ThreadSystemConfig.cmake.in — consumer-side config template

How

1. In find_common_system_dependency(), after find_package(common_system CONFIG) succeeds, link the target:

   if(common_system_FOUND AND TARGET kcenon::common_system)
       target_link_libraries(ThreadSystem PUBLIC kcenon::common_system)
   endif()

2. Verify ThreadSystemConfig.cmake.in includes find_dependency(common_system CONFIG REQUIRED)
3. Test with vcpkg overlay port build

Acceptance Criteria

• find_package(common_system CONFIG) path properly links kcenon::common_system to ThreadSystem target
• vcpkg overlay port build succeeds (vcpkg install kcenon-thread-system)
• Downstream find_package(ThreadSystem CONFIG) resolves common_system transitively
• Existing add_subdirectory() path remains unaffected
• CI passes on all platforms (Linux/Windows/macOS)

Context

• Blocking: monitoring_system#282, docs: fix broken links and add missing documentation #283, ci: Standardize common_system checkout using actions/checkout@v4 #284
• Related: monitoring_system#279 (vcpkg registry registration tracking)
• See: monitoring_system/docs/guides/VCPKG_OVERLAY_PORTS.md Known Issues section