Cli

Migrating OpenCode from v1 to v2: the switch script and plugins that serve both versions

OpenCode moved to v2 and v1 plugins no longer run as-is. Two jobs: migrate your machine without losing your sessions (a switch script, a database backup, the config move, the caveman local-copy subtlety) and port your plugins so one package serves both v1 and v2 from a single entry point.