feat(session): add catalog-only rename command

[devmobasa]

Summary

• add --rename-session NAME --session-file PATH
• update only the named-session catalog display name, leaving session files and sidecars untouched
• keep catalog renames independent of config.toml loading
• reject overlay and daemon options that cannot be honored by the offline rename command
• update CLI usage and add regression coverage for catalog behavior, invalid configuration, and conflicting flags