What

Document the standardized snake_case PACKAGE_NAME convention for all kcenon ecosystem vcpkg ports, and track upstream adoption to eventually remove wrapper config files.

Part of #532

Why

After standardizing overlay port PACKAGE_NAME to snake_case (sibling sub-issue), the convention should be documented so new ports and consumers follow it consistently.

How

1. Add convention documentation to vcpkg-ports/README.md or equivalent
2. File upstream issues in each PascalCase repo for native snake_case support:
   • kcenon/logger_system
   • kcenon/container_system
   • kcenon/database_system
   • kcenon/network_system
3. Document the target naming table for consumers
4. Add migration guide for existing consumers

Acceptance Criteria

• Convention documented
• Upstream issues filed for native snake_case adoption
• Consumer migration guide available