fix: revert delegate-task to string category schema, fix mock isolation and restore UB7 originals

src/shared/legacy-plugin-warning.test.ts

@@ -1,5 +1,3 @@
-/// <reference path="../../bun-test.d.ts" />
-
 import { afterEach, beforeEach, describe, expect, it } from "bun:test"
 import { mkdirSync, rmSync, writeFileSync } from "node:fs"
 import { tmpdir } from "node:os"
@@ -82,26 +80,4 @@ describe("checkForLegacyPluginEntry", () => {
     expect(result.legacyEntries).toEqual([])
     expect(result.configPath).toBeNull()
   })
-
-  describe("#given a project-local .opencode config contains a legacy plugin entry", () => {
-    it("#then detects the project-local config path", () => {
-      // given
-      const projectDir = join(testConfigDir, "project")
-      const projectConfigDir = join(projectDir, ".opencode")
-      mkdirSync(projectConfigDir, { recursive: true })
-      writeFileSync(
-        join(projectConfigDir, "opencode.json"),
-        JSON.stringify({ plugin: ["oh-my-opencode"] }, null, 2),
-      )
-
-      // when
-      const result = checkForLegacyPluginEntry(undefined, projectDir)
-
-      // then
-      expect(result.hasLegacyEntry).toBe(true)
-      expect(result.hasCanonicalEntry).toBe(false)
-      expect(result.legacyEntries).toEqual(["oh-my-opencode"])
-      expect(result.configPath).toBe(join(projectConfigDir, "opencode.json"))
-    })
-  })
 })