v0.94.0: serialize per-disk SMART into the /disks payload

Additive, backward-compatible (MinAgent floor unchanged). The SMART is already
computed on the request path (storage.Observe -> enrich); this copies the target's
Smart into localapi.DiskInfo (pointer, omitempty) only when Health != "", so an
unread/absent summary stays omitted and the controller renders "Nincs adat".
No new smartctl load, endpoint, or sudoers change.

Test TestDisks_SmartSerialized + red-proof (drop the copy -> fails).

CONTEXT.md

@@ -5,6 +5,12 @@
 
 ## Current
 
+- **2026-07-24 — v0.94.0 (additive): SMART serialized into /disks.** `localapi.DiskInfo` gains
+  `Smart *hub.SmartSummary` (omitempty), copied from the target's already-computed Observe-time
+  enrichment when `Health != ""` — no new smartctl load, no endpoint, no sudoers/MinAgent change. The
+  controller v0.169.0 renders a "Lemezek állapota" card + 6h degradation alert from it; old controllers
+  ignore it. **NOTE: at the remote-site vacation window the agent is DOWN (localapi binds .162 → fails),
+  so live /disks-from-real-agent validation is deferred — the field is unit-proven; publish only.**
 - **2026-07-22 — v0.93.0 is the FLEET AGENT.** Built, published (sha `a68b2ff73200622e…`),
   Day-0-manifest-vouched (MinAgent also 0.93.0, operator-ruled) and deployed to BOTH boxes
   (`demo-felhom-8363b5` + `demo-hp-bb76ea`, the latter over G1 break-glass — still no key baked);