What

Perform a comprehensive audit of all public API headers to verify v1.0 readiness. Confirm API stability, verify Result migration completeness, and validate CMake export target naming.

Part of #604

Why

Before freezing the API for v1.0, every public header must be reviewed to ensure:

• No unintended breaking changes remain
• Result pattern is consistently used (no raw throws in operation paths)
• CMake target name matches documented expectations

How

Technical Approach

1. Review all 74 public headers in include/kcenon/logger/
2. Verify throw statements are limited to defensive patterns (Result accessors, constructor validation)
3. Validate CMake target name: issue Prepare logger_system for v1.0 release #604 specifies logger_system::logger_system but current export is logger_system::logger — determine which is correct and align
4. Check find_package(logger_system) config files are complete

Acceptance Criteria

• All public headers reviewed for API stability
• Throw statements documented and confirmed as appropriate
• CMake target name verified and aligned with documentation
• No deprecated markers remain in public API (verify refactor(api): remove deprecated methods from logger public API #534 completion)