v0.2.3

• Adds safe stage-specific config-flow diagnostics for session, login, Network-version read, Device read, compatibility filtering, and logout.
• Preserves existing authentication, permission, TLS, timeout, connection, Site, and compatibility error classes.
• Logs only the validation stage, safe category, exception type, and optional numeric HTTP status.
• Adds regression coverage proving exception messages and sensitive values are not logged.