refactor(tool): Tool.Def.execute returns Effect, rename defineEffect → define (#21961)

packages/opencode/test/tool/skill.test.ts

@@ -156,12 +156,11 @@ Use this skill.
           const requests: Array<Omit<Permission.Request, "id" | "sessionID" | "tool">> = []
           const ctx: Tool.Context = {
             ...baseCtx,
-            ask: async (req) => {
-              requests.push(req)
-            },
+            ask: (req) =>
+              Effect.sync(() => { requests.push(req) }),
           }
 
-          const result = await tool.execute({ name: "tool-skill" }, ctx)
+          const result = await runtime.runPromise(tool.execute({ name: "tool-skill" }, ctx))
           const dir = path.join(tmp.path, ".opencode", "skill", "tool-skill")
           const file = path.resolve(dir, "scripts", "demo.txt")