fix(tools): preserve complete bounded presentations

packages/fs/tool-fs/tests/read-render.spec.ts

@@ -86,6 +86,7 @@ describe('buildWindow', () => {
     it('caps output at a custom maxBytes', async () => {
       const result = await buildWindow(whole('aaaa\nbbbb\ncccc'), { offset: 1, limit: 10, maxLineLength: 2000, maxBytes: 9 }, 'f')
       expect(result.lines.map(l => l.text)).toEqual(['aaaa', 'bbbb'])
+      expect(result.totalLines).toBe(3)
       expect(result.truncatedByBytes).toBe(true)
     })
   })
@@ -105,6 +106,7 @@ describe('buildWindow', () => {
     it('caps output bytes mid-stream', async () => {
       const big = Array.from({ length: 2000 }, () => 'y'.repeat(100)).join('\n')
       const result = await buildWindow(chunked(big, 512), READ_ALL, 'f')
+      expect(result.totalLines).toBe(2000)
       expect(result.truncatedByBytes).toBe(true)
     })
 

packages/fs/tool-fs/tests/tools.spec.ts

@@ -572,6 +572,9 @@ describe('read caps are plugin config', () => {
     const { ctx, fs } = await setupWith({ readMaxBytes: 9 })
     fs.files.set('key:a.txt', 'aaaa\nbbbb\ncccc')
     const result = await call(ctx, 'read', { file_path: 'a.txt' })
+    expect(result.isError).toBe(false)
+    if (result.isError) throw new Error('expected read success')
+    expect(result.value).toMatchObject({ totalLines: 3 })
     expect(text(result)).toContain('Output capped.')
     expect(text(result)).not.toContain('cccc')
   })