Merges paperclipai/paperclip#62 onto latest master (494448d).
Adds complete OpenCode provider with strict model selection,
dynamic model discovery, CLI/server/UI adapter registration.
Resolved conflicts with master's cursor adapter additions,
node v24 typing, and containerized opencode support (201d91b).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>