feat!: configure_snmp_agent with the caller's values replaces fix_snmp (0.3.0)

fix_snmp wrote an application's snmpd.conf (community public, Managed
by netOrk, netork@localhost) and judged itself by a local snmpget.

The drivers implement napalm-device-types 4.13's SnmpAgentMixin steps
instead: net-snmp installed, snmpd.conf with one rocommunity line per
allowed source (staged without privilege, installed by root), snmpd
enabled and restarted. pf and ipfw rules stay the operator's. A
community or text that would break the file is refused. The caller
verifies with its own SNMP client.

Also get_management_peer() from SSH_CONNECTION, ensure_package from
the base package, and get_snmp_config no longer assumes "public".

BREAKING CHANGE: run_device_action is removed. Requires
napalm-device-types 4.13.

Part of #12 (the OpenBSD new_version text is still open).

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-bsd"
-version = "0.2.1"
+version = "0.3.0"
 description = "NAPALM drivers for FreeBSD and OpenBSD hosts via SSH"
 readme = "README.md"
 requires-python = ">=3.10"
@@ -26,7 +26,7 @@ classifiers = [
 ]
 dependencies = [
     "napalm>=4.0",
-    "napalm-device-types>=4.7.1",  # channel.run_on_transport; OSDriver.get_os_users
+    "napalm-device-types>=4.13.0",  # fixes: SnmpAgentMixin, EnsurePackageMixin
     "paramiko>=5.0.0",  # CVE-2026-44405
 ]