[Suggestion] Remove deprecated OpenCode v1 support #5

Is your feature request related to a problem? Please describe.

The v2 migration will retain deprecated v1 adapters for a transition period so current OpenCode v1 users are not broken. Once v2 adoption is established, the legacy host APIs and compatibility adapters should be removed.

Describe the solution you'd like

Remove the deprecated v1 runtime adapters, v1 host types, compatibility exports, mocks, and documentation from opencode-wlib. Keep the v2 contract as the only supported implementation.

This should be handled after the v2 migration in #4 and coordinated with the consumer repositories.

Describe alternatives you've considered

Keeping both APIs indefinitely would preserve compatibility but increase maintenance and make future OpenCode API changes harder to adopt.

Additional context

Coordinate removal with:

• [Suggestion] Migrate Persona Injector to OpenCode 2 (V2) opencode-persona-injector#34
• [Suggestion] Migrate model-usage plugin to OpenCode v2 opencode-model-usage#47

Media

N/A