Drop per-task port blocks; previews use any free loopback port

internal/agents/bash.go

@@ -39,7 +39,7 @@ func (m *Manager) bashTool(l *live) mcp.Tool {
 	return mcp.Tool{
 		Name: "bash",
 		Description: "Run a shell command on the Mac byre runs on, in your task's worktree, with $SHELL as a login shell, and get its exit status and output (stdout and stderr together, the last 64 KiB). " +
-			"byre runs it itself, outside any sandbox your own shell tool has, with byre's environment and $PORT set to this task's first port. " +
+			"byre runs it itself, outside any sandbox your own shell tool has, with byre's environment. " +
 			"Stdin is empty. The command runs in its own process group, which is killed at the timeout.",
 		InputSchema: json.RawMessage(`{
 			"type": "object",
@@ -65,10 +65,6 @@ func (m *Manager) bash(ctx context.Context, l *live, raw json.RawMessage) (strin
 	if err != nil {
 		return "", err
 	}
-	task, err := m.store.GetTask(ctx, l.taskID)
-	if err != nil {
-		return "", err
-	}
 	shell := os.Getenv("SHELL")
 	if shell == "" {
 		return "", errors.New("SHELL is not set in byre's environment")
@@ -78,7 +74,6 @@ func (m *Manager) bash(ctx context.Context, l *live, raw json.RawMessage) (strin
 	defer cancel()
 	cmd := procgroup.CommandContext(cctx, shell, "-l", "-c", args.Command)
 	cmd.Dir = l.dir
-	cmd.Env = append(os.Environ(), portEnv(task)...)
 	cmd.WaitDelay = 5 * time.Second
 	out := &tailWriter{}
 	cmd.Stdout = out