perf(runtime): gate terminal.list visual layouts and stop the false writable claim

visualLayouts is ~31% of a large terminal.list payload (44,208 B of 137,412 B on a live 134-terminal remote runtime) and has exactly one consumer: the human-readable CLI formatter. Gate it behind an includeVisualLayouts request param that defaults to included, so pre-flag clients are unaffected, and have every --json/internal caller opt out.

Also drop the record-backed builder's writable, which was a verbatim copy of connected. terminal.show now states writability explicitly as exactly what terminal.send's PTY gate enforces.

src/cli/handlers/terminal.ts

@@ -55,7 +55,9 @@ export const TERMINAL_HANDLERS: Record<string, CommandHandler> = {
   'terminal list': async ({ flags, client, cwd, json }) => {
     const result = await client.call<RuntimeTerminalListResult>('terminal.list', {
       worktree: await getOptionalWorktreeSelector(flags, 'worktree', cwd, client),
-      limit: getOptionalPositiveIntegerFlag(flags, 'limit')
+      limit: getOptionalPositiveIntegerFlag(flags, 'limit'),
+      // Why: only the human formatter renders layouts; --json ships and discards them.
+      includeVisualLayouts: !json
     })
     printResult(result, json, formatTerminalList)
   },

src/cli/index.test.ts

@@ -3702,10 +3702,28 @@ describe('orca cli worktree awareness', () => {
 
     expect(callMock).toHaveBeenNthCalledWith(2, 'terminal.list', {
       worktree: 'id:repo::/tmp/repo/feature',
-      limit: undefined
+      limit: undefined,
+      includeVisualLayouts: false
     })
   })
 
+  it('requests visual layouts only for the human-readable terminal list', async () => {
+    queueFixtures(
+      callMock,
+      worktreeListFixture([buildWorktree('/tmp/repo/feature', 'feature/foo')]),
+      okFixture('req_term', { terminals: [], totalCount: 0, truncated: false })
+    )
+    vi.spyOn(console, 'log').mockImplementation(() => {})
+
+    await main(['terminal', 'list', '--worktree', 'active'], '/tmp/repo/feature/src')
+
+    expect(callMock).toHaveBeenNthCalledWith(
+      2,
+      'terminal.list',
+      expect.objectContaining({ includeVisualLayouts: true })
+    )
+  })
+
   it('rejects implicit remote terminal create instead of resolving from client cwd', async () => {
     const logSpy = vi.spyOn(console, 'log').mockImplementation(() => {})
     const errSpy = vi.spyOn(console, 'error').mockImplementation(() => {})