feat!: report the subscription as a license, not a warning (0.4.0)

get_device_warnings is gone; netOrk names the warnings from facts
(netOrk #1111). lldpd and the pending updates were already facts
(get_packages, get_available_updates). The subscription is now
get_licenses() from napalm-device-types 4.14's LicenseMixin: one
pve-subscription entry, the API status mapped to a LicenseStatus.

The old check compared against "NotFound" while the API answers
"notfound" (seen on all four nodes), so it never fired; the mapping is
case-insensitive.

CHANGELOG.md

@@ -8,6 +8,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ### Changed
+- **Breaking:** `get_device_warnings` is gone; the node reports facts and the caller
+  names the warnings (netOrk #1111). lldpd and the pending updates were already facts
+  (`get_packages`, `get_available_updates`). The subscription is now
+  `get_licenses()` (napalm-device-types 4.14 `LicenseMixin`): one `pve-subscription`
+  entry with the API's status as a `LicenseStatus` (`notfound` → `none`, `new` and
+  `suspended` → `unknown`), its message as `detail`, product name and due date when
+  subscribed. The old check compared against `NotFound` while the API answers
+  `notfound`, so it never fired. Requires napalm-device-types 4.14.0; version 0.4.0.
 - **Breaking:** `run_device_action` (`fix_snmp`, `install_lldpd`) is gone. The driver
   implements napalm-device-types 4.13's fix templates: `configure_snmp_agent(settings)`
   with the caller's community and allowed sources (one `rocommunity` line each, ufw only