fix: restore controlled tools on v2

[kitlangton]

What

Restore controlled tools when Drive runs against the current OpenCode V2 plugin API, and add typed control for write calls.

Before / After

Before: Drive's injected plugin used the old three-argument tools.add API and context.callID. Current V2 rejected the registration with tool.name undefined, so controlled tools never loaded. Scripts also could not declare write as a typed controlled tool.

After: The plugin registers complete V2 tool definitions, reads context.id, and returns canonical tool results. Scripts can declare tools: ["write"], claim the typed call, and settle it with an output string.

How

• Update the injected plugin adapter to the current V2 tool definition and result shapes.
• Add WriteInput, WriteResult, handler, and runtime-control types.
• Add write registration and controlled-call routing to the tool controller.
• Update plugin adapter tests and cover typed write routing.
• Add a patch changeset for opencode-drive.

Scope

This does not update the pinned generated OpenCode client or alter arbitrary provider-backed dynamic tool control.

Testing

• bun run check in packages/drive
• bun run test:effect in packages/drive (205 passed)