refactor(core): consolidate tool architecture

packages/plugin/src/effect/reference.ts

@@ -0,0 +1,15 @@
+import type { ReferenceGitSource, ReferenceLocalSource } from "@opencode-ai/client"
+import type { ReferenceApi } from "@opencode-ai/client/effect/api"
+import type { Effect } from "effect"
+import type { Transform } from "./registration.js"
+
+export interface ReferenceDraft {
+  add(name: string, source: ReferenceLocalSource | ReferenceGitSource): void
+  remove(name: string): void
+  list(): readonly (readonly [string, ReferenceLocalSource | ReferenceGitSource])[]
+}
+
+export interface ReferenceDomain extends ReferenceApi<unknown> {
+  readonly transform: Transform<ReferenceDraft>
+  readonly reload: () => Effect.Effect<void>
+}