Fix CogUtil CMake configuration and resolve dependency issues

[Copilot]

Problem

The CogUtil implementation was complete and functional, but had CMake configuration issues that prevented dependent projects from finding and linking to it properly. This caused several modules (robotics-embodied, cogserver, etc.) to be excluded from builds due to "missing CogUtil" errors.

Root Cause

The cogutil-config.cmake.in template was missing essential CMake helpers and compatibility variables needed for proper package discovery:

# Before - caused "Unknown CMake command" errors
check_required_components(cogutil)

Solution

Enhanced the CMake configuration to provide proper package support:

1. Fixed Package Configuration: Updated cogutil-config.cmake.in to use CMakePackageConfigHelpers and include necessary CMake modules
2. Added Compatibility Variables: Provided multiple variable names (COGUTIL_*, CogUtil_*) for different dependent projects
3. Enhanced Build System: Updated CMakeLists.txt to use proper package configuration helpers
4. Resolved Dependencies: Updated root build exclusions to reflect that CogUtil is no longer the blocking issue

Key Changes

• Enhanced cogutil/cogutil-config.cmake.in with proper CMake helpers and compatibility variables
• Updated cogutil/CMakeLists.txt to use configure_package_config_file()
• Fixed cogutil/demo.sh path resolution
• Updated root CMakeLists.txt dependency comments to reflect resolved CogUtil issues

Validation

The fix enables dependent projects to successfully find CogUtil:

# Before: Failed with "missing CogUtil"
cmake /path/to/robotics-embodied  # ❌ CogUtil not found

# After: CogUtil found successfully  
cmake /path/to/robotics-embodied  # ✅ CogUtil found, now fails on AtomSpace (expected)

Integration test confirms proper functionality:

#include <opencog/util/cogutil_minimal.h>
opencog::util::initialize_cogutil();  // ✅ Works
auto tensor = opencog::util::TensorUtils::createTensor();  // ✅ Works

Impact

• robotics-embodied: No longer blocked by missing CogUtil dependency
• Build System: Cleaner, more accurate dependency tracking
• Future Projects: Reliable Foundation Layer available with proper CMake support
• Backwards Compatibility: All existing functionality preserved

The CogUtil Foundation Layer (524,288 DOF tensor architecture) is now properly packaged and ready for use across the OpenCog ecosystem.

Original prompt

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This section details on the original issue you should resolve

<issue_title>cogutil</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #6

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