feat: FreeBSD and OpenBSD drivers, read side

FreeBSDDriver (`freebsd`) and OpenBSDDriver (`openbsd`) on a shared
BsdDriver, for the BSD VMs netOrk provisions and BSD hosts added by hand
(NetOrk/netork#798).

- SSH over exec channels (napalm-device-types' run_on_transport): no PTY,
  stdout and stderr apart, real exit codes; run_command()/open_stream()
  are public. Root through `sudo -S` with the password on stdin, or
  `sudo -n` without one.
- Facts: hostname, release and running kernel (freebsd-version / uname),
  hardware from SMBIOS (kenv) or hw.* sysctls, uptime from kern.boottime.
- Interfaces and addresses (ifconfig -a: ether/lladdr, hex netmasks,
  scoped IPv6), routes (netstat -rn, OpenBSD's abbreviated networks
  written out, host/broadcast/loopback entries left out), ARP (FreeBSD's
  sentences, OpenBSD's table), users and groups, processes (lstart read as
  one five-word field), cron jobs (system crontab and the login user's).
- Parsers are pure functions, tested on output recorded from FreeBSD 15.1
  (hand-installed and cloud image) and OpenBSD 7.9 (NetOrk/netork#793),
  with internal addresses replaced by documentation ranges.

pyproject.toml

@@ -0,0 +1,49 @@
+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "napalm-bsd"
+version = "0.1.0"
+description = "NAPALM drivers for FreeBSD and OpenBSD hosts via SSH"
+readme = "README.md"
+requires-python = ">=3.10"
+license = { text = "Apache-2.0" }
+authors = [
+    { name = "Christian Manivong", email = "christian@manivong.de" },
+]
+keywords = ["napalm", "network", "automation", "freebsd", "openbsd", "bsd", "ssh", "driver"]
+classifiers = [
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: System Administrators",
+    "License :: OSI Approved :: Apache Software License",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Topic :: System :: Systems Administration",
+]
+dependencies = [
+    "napalm>=4.0",
+    "napalm-device-types>=2.6.0",  # channel.run_on_transport
+    "paramiko>=5.0.0",  # CVE-2026-44405
+]
+
+[project.optional-dependencies]
+dev = ["pytest", "pytest-cov", "ruff", "mypy"]
+
+[project.entry-points."napalm.drivers"]
+freebsd = "napalm_bsd:FreeBSDDriver"
+openbsd = "napalm_bsd:OpenBSDDriver"
+
+[project.urls]
+Repository = "https://git.netork.io/NAPALM/napalm-bsd"
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["napalm_bsd*"]
+
+[tool.ruff]
+line-length = 100
+target-version = "py310"