Summary

Replace PACS_WITH_COMMON_SYSTEM with KCENON_HAS_COMMON_SYSTEM in pacs_system.

5W1H Specification

• Who: pacs_system maintainers
• What: Replace PACS_WITH_COMMON_SYSTEM checks
• Where: PACS integration code paths
• When: TBD
• Why: Remove PACS-specific macro naming divergence
• How: Include feature_flags header and update macros

Parent Issue

kcenon/common_system#223

Tasks

• Include feature_flags.h in PACS integration headers
• Replace PACS_WITH_COMMON_SYSTEM with KCENON_HAS_COMMON_SYSTEM
• Update CMake to keep PACS_WITH_COMMON_SYSTEM as legacy alias

Acceptance Criteria

• No PACS_WITH_COMMON_SYSTEM checks remain in code
• Integration behavior remains unchanged