Conducted comprehensive code review of TOML configuration implementation for issue #248.

Review Findings

Approved - Implementation is production-ready.

Architecture

• Three-tier priority (CLI > user config > defaults) correctly implemented
• Flat TOML structure avoids unnecessary nesting complexity
• default.toml bundled via importlib.resources - works in dev and installed modes

Code Quality

• 56 config tests, all passing
• Zero linting/type-checking issues (ruff, mypy, black)
• Comprehensive validation with cross-field checks (e.g., dirty_threshold ≤ base_broadcast_interval)
• Unknown key detection prevents silent typo failures

Key Implementation Details

# Configuration priority enforced in create_config_from_args:
# 1. load_default_config() - bundled default.toml
# 2. load_config_from_toml(user_path) - user overrides
# 3. merge_cli_args() - CLI takes precedence
# 4. validate_config() - comprehensive validation

Security & Performance

• Input validation prevents injection
• Config loaded once at startup (zero runtime overhead)
• No hardcoded secrets or unsafe file operations

Backward Compatibility

• Server operates without config file using bundled defaults
• Existing CLI arguments preserved
• No breaking changes

Files Changed

• config.py (420 lines) - configuration management
• default.toml (106 lines) - bundled defaults
• test_config.py (759 lines) - test suite
• Updated server.py, binary_serializer.py, README.md

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