schema: re-introspect Unraid API against 7.3

7.3 findings (all existing queries confirmed working — no breaking changes):
- ArrayParity/ArrayCache no longer exist as named types; everything is ArrayDisk
- InfoOs gained: kernel, arch, fqdn, build, codename, platform, serial, uefi
- InfoCpu gained: manufacturer, model, speed, speedmin/max, processors, socket, topology
- ArrayDisk gained: idx, numReads/Writes/Errors, warning/critical temps, color, fsType
- MemoryUtilization gained: free, active, buffcache, swapFree, percentSwapTotal

Changes:
- Add kernel to master GQL query (useful for display)
- Update schema comments to reflect 7.3 reality
- Remove ArrayParity/ArrayCache from api_test.php introspection (now null types)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Plugin/unraid/include/unraid_api.php

@@ -2,14 +2,20 @@
 // Unraid GraphQL API — single-request master fetch + per-function fallback tracking.
 // All API-first functions call vv_api_data() then fall back to local reads on null.
 //
-// Confirmed schema (introspected 2026-05-29):
-//   InfoOs:     hostname, uptime (String), release — no version/uptime-as-int
-//   InfoCpu:    brand, threads, cores — no physicalCores/currentLoad
-//   InfoMemory: layout only — NO usage fields; memory usage stays as local read
-//   ArrayDisk:  single list for all types (DATA/PARITY/CACHE); fields: name, device,
-//               type (ArrayDiskType enum), status (ArrayDiskStatus enum), size (BigInt),
-//               fsSize, fsFree, fsUsed (BigInt), temp, transport (String), rotational,
-//               isSpinning — no free/mounted
+// Confirmed schema (introspected 2026-05-31, Unraid 7.3):
+//   InfoOs:     hostname, uptime (String), release, kernel (NEW 7.3), arch (NEW 7.3)
+//               — also new but unused: fqdn, build, codename, platform, distro, serial, uefi
+//               — no version/uptime-as-int
+//   InfoCpu:    brand, threads, cores — also new but unused: manufacturer, model, speed,
+//               speedmin, speedmax, processors, socket, topology, packages
+//   InfoMemory: layout only — NO usage fields; memory usage via metrics.memory
+//   ArrayDisk:  used for parities/disks/caches (ArrayParity/ArrayCache named types removed in 7.3)
+//               fields: name, device, type (ArrayDiskType enum), status (ArrayDiskStatus enum),
+//               size (BigInt), fsSize, fsFree, fsUsed (BigInt), temp, transport (String),
+//               rotational, isSpinning, fsType (String) — also new: numReads, numWrites,
+//               numErrors (BigInt), idx, warning, critical, color, exportable, comment, format
+//   MemoryUtilization: percentTotal, total, used, available, swapTotal, swapUsed —
+//               also new: free, active, buffcache, swapFree, percentSwapTotal
 //   VmDomain:   name, state (VmState enum) — no memory/vcpus
 
 require_once __DIR__ . '/config.php';
@@ -52,13 +58,14 @@ function vv_api_data(): ?array {
         return null;
     }
 
-    // Fields verified against live schema introspection (2026-05-29).
+    // Fields verified against live schema introspection (2026-05-31, Unraid 7.3).
     // array.parities / .disks / .caches are SEPARATE lists — .disks is DATA only.
+    // ArrayParity/ArrayCache are no longer named types in 7.3 but the query structure is unchanged.
     // metrics.cpu.percentTotal and metrics.memory.* provide real-time utilisation.
     $gql = <<<'GQL'
 {
   info {
-    os  { hostname uptime release }
+    os  { hostname uptime release kernel }
     cpu { brand threads cores }
   }
   metrics {
@@ -180,7 +187,7 @@ function vv_api_node_metrics(?array $d): array {
     ];
 }
 
-// ── Confirmed schema (Unraid 7.2.5, introspected 2026-05-29) ─────────────────
+// ── Confirmed schema (Unraid 7.3, introspected 2026-05-31) ───────────────────
 // Adding a new host: add HOSTn="hostname" to master.conf and HOSTn_UNRAID_API_KEY
 // to hostn.conf, then run Deployment/deploy.sh. No schema work needed.
 //