feat: run commands and streams on an exec channel, reach the container engine

netOrk drove this driver's shell through the private `_send` (an
interactive PTY, stdout and stderr merged, no exit code) and opened its
own paramiko connections for Docker. napalm-device-types 2.6.0 makes the
channel public; this implements it (NetOrk/netork#765):

- `run_command()` and `open_stream()` open an exec channel on the SSH
  transport netmiko already holds: no second login, no PTY, a real exit
  status.
- `privileged=True` follows the driver's existing rules: as root the
  command runs directly; with a sudo password it goes through
  `sudo -S -p ''` and the password is written to stdin, never onto the
  command line; without one `sudo -n` fails at once instead of hanging.
- `ContainerEngineMixin` is mixed in, so `open_container_engine("docker")`
  streams the Engine API over `docker system dial-stdio`.

The existing Docker methods are unchanged. Version 0.2.0, requires
napalm-device-types >= 2.6.0.

Refs NAPALM/napalm-device-types#17

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-linux"
-version = "0.1.0"
+version = "0.2.0"
 description = "NAPALM driver for generic Linux systems via SSH"
 readme = "README.md"
 requires-python = ">=3.9"
@@ -37,7 +37,7 @@ classifiers = [
 ]
 dependencies = [
     "napalm>=4.0",
-    "napalm-device-types>=2.4.0",
+    "napalm-device-types>=2.6.0",
     "netmiko>=4.0.0",
     "paramiko>=5.0.0",  # CVE-2026-44405
 ]