refactor(core): consolidate tool architecture

packages/plugin/src/effect/command.ts

@@ -0,0 +1,16 @@
+import type { CommandApi } from "@opencode-ai/client/effect/api"
+import type { CommandInfo } from "@opencode-ai/client"
+import type { Effect } from "effect"
+import type { Transform } from "./registration.js"
+
+export interface CommandDraft {
+  list(): readonly CommandInfo[]
+  get(name: string): CommandInfo | undefined
+  update(name: string, update: (command: CommandInfo) => void): void
+  remove(name: string): void
+}
+
+export interface CommandDomain extends CommandApi<unknown> {
+  readonly transform: Transform<CommandDraft>
+  readonly reload: () => Effect.Effect<void>
+}