refactor: Maintain single code path for package manager execution (#256)

* refactor: Maintain single code path for package manager execution

* fix: Avoid context leak during interactive TTY read

* fix: PTY flow handling

* fix: Linter fixes

internal/pty/input_read_windows.go

@@ -0,0 +1,17 @@
+//go:build windows
+
+package pty
+
+import (
+	"context"
+	"io"
+)
+
+func readInput(ctx context.Context, src io.Reader, buf []byte) (int, error) {
+	select {
+	case <-ctx.Done():
+		return 0, ctx.Err()
+	default:
+		return src.Read(buf)
+	}
+}