fix(acp): clean read tool display content (#30569)

packages/opencode/test/tool/read.test.ts

@@ -428,6 +428,15 @@ describe("tool.read truncation", () => {
       const result = yield* run({ filePath: path.join(test.directory, "small.txt") })
       expect(result.metadata.truncated).toBe(false)
       expect(result.output).toContain("End of file")
+      expect(result.metadata.display).toMatchObject({
+        type: "file",
+        path: path.join(test.directory, "small.txt"),
+        text: "hello world",
+        lineStart: 1,
+        lineEnd: 1,
+        totalLines: 1,
+        truncated: false,
+      })
     }),
   )
 
@@ -495,6 +504,14 @@ describe("tool.read truncation", () => {
       const result = yield* exec(dir, { filePath: path.join(dir, "dir"), offset: 6, limit: 5 })
       expect(result.metadata.truncated).toBe(false)
       expect(result.output).not.toContain("Showing 5 of 10 entries")
+      expect(result.metadata.display).toMatchObject({
+        type: "directory",
+        path: path.join(dir, "dir"),
+        entries: ["file-5.txt", "file-6.txt", "file-7.txt", "file-8.txt", "file-9.txt"],
+        offset: 6,
+        totalEntries: 10,
+        truncated: false,
+      })
     }),
   )