feat: report running_kernel (uname -r) in get_facts

Distinguishes the currently-booted kernel from a newer installed-but-not-yet-
booted one, for kernel CVE relevance.

napalm_proxmox/driver.py

@@ -431,6 +431,14 @@ class ProxmoxDriver(
         except Exception as exc:
             logger.debug("Failed to read DMI info via SSH: %s", exc)
 
+        # Currently-booted kernel release (uname -r) — distinct from any newer
+        # kernel that is merely installed and pending a reboot.
+        running_kernel = ""
+        try:
+            running_kernel = self._exec_ssh_command("uname -r").strip()
+        except Exception as exc:
+            logger.debug("Failed to read running kernel via SSH: %s", exc)
+
         return {
             "uptime": uptime,
             "vendor": vendor or "Proxmox Server Solutions GmbH",
@@ -440,6 +448,7 @@ class ProxmoxDriver(
             "os_version": os_version,
             "serial_number": serial,
             "interface_list": iface_list,
+            "running_kernel": running_kernel,
         }
 
     # ------------------------------------------------------------------ #