refactor(core): simplify plugin entrypoint resolution

packages/core/test/config/fixtures/plugins/folder-plugin/index.ts

@@ -1,13 +0,0 @@
-import { Plugin } from "@opencode-ai/plugin/v2"
-
-export default Plugin.define({
-  id: "folder-plugin",
-  setup: async (ctx) => {
-    await ctx.agent.transform((agents) => {
-      agents.update("folder", (agent) => {
-        agent.description = "Loaded from plugin folder"
-        agent.mode = "subagent"
-      })
-    })
-  },
-})

packages/core/test/config/plugin.test.ts

@@ -134,7 +134,7 @@ describe("PluginSupervisor config", () => {
     ),
   )
 
-  it.live("loads auto-discovered plugin files and packages", () =>
+  it.live("loads auto-discovered plugin files", () =>
     withLocation(
       undefined,
       Effect.gen(function* () {
@@ -143,9 +143,6 @@ describe("PluginSupervisor config", () => {
         expect(yield* agents.get(AgentV2.ID.make("directory"))).toMatchObject({
           description: "Loaded from plugin directory",
         })
-        expect(yield* agents.get(AgentV2.ID.make("folder"))).toMatchObject({
-          description: "Loaded from plugin folder",
-        })
       }),
       true,
     ),
@@ -195,7 +192,6 @@ describe("PluginSupervisor config", () => {
         yield* ready()
         const agents = yield* AgentV2.Service
         expect(yield* agents.get(AgentV2.ID.make("directory"))).toBeUndefined()
-        expect(yield* agents.get(AgentV2.ID.make("folder"))).toBeUndefined()
       }),
       true,
     ),

packages/core/test/npm.test.ts

@@ -41,19 +41,27 @@ describe("Npm.add", () => {
     await fs.mkdir(path.join(tmp.path, "fixture-provider"))
     await writePackage(path.join(tmp.path, "fixture-provider"), {
       name: "fixture-provider",
-      main: "index.js",
+      exports: {
+        ".": "./index.js",
+        "./tui": "./tui.js",
+      },
     })
     await Bun.write(path.join(tmp.path, "fixture-provider", "index.js"), "export const fixture = true\n")
+    await Bun.write(path.join(tmp.path, "fixture-provider", "tui.js"), "export const tui = true\n")
 
     const spec = `fixture-provider@file:${path.join(tmp.path, "fixture-provider")}`
     await fs.mkdir(path.join(tmp.path, "cache", "packages", Npm.sanitize(spec)), { recursive: true })
 
-    const entry = await Effect.gen(function* () {
+    const entries = await Effect.gen(function* () {
       const npm = yield* Npm.Service
-      return yield* npm.add(spec)
+      return {
+        tui: yield* npm.add(spec, { subpaths: ["tui", ""] }),
+        fallback: yield* npm.add(spec, { subpaths: ["missing", ""] }),
+      }
     }).pipe(Effect.scoped, Effect.provide(npmLayer(path.join(tmp.path, "cache"))), Effect.runPromise)
 
-    expect(entry.entrypoint).toBeDefined()
+    expect(entries.tui.entrypoint).toEndWith("/tui.js")
+    expect(entries.fallback.entrypoint).toEndWith("/index.js")
   })
 })