docs(sitestream): document aggregated live alarm stream + resolve deferred #10 (plan #10 T8)

Alarm Summary is now live-cache-driven via a transient per-site central
live alarm cache (ISiteAlarmLiveCache) fed by a site-wide, alarm-only
SubscribeSite gRPC stream (seed-then-stream), with the 15s poll retained
as fallback + NotReporting authority. No persisted central alarm store
([PERM]). Updated Component-CentralUI, Component-Communication (new §6.1
+ SubscribeSite RPC), M7 design (T13 delivered note), native-alarms
[PERM] note, stillpending follow-up note, CLAUDE.md, and moved register
row #10 to Resolved (left #22 in place for the sibling branch).

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

docs/plans/2026-06-18-m7-opcua-mxgateway-ux-design.md

@@ -32,6 +32,10 @@ from the merged `fix/mxgw-supervisory-write`). M7 does **not** reinvent those
 - **Central alarm store / history / journal** — T13 reads live snapshots; no central alarm
   tables (remains `[PERM]` per `2026-05-29-native-alarms-design.md`). No aggregated live gRPC
   stream for the summary page in v1 (snapshot + poll only).
+  **Delivered 2026-07-10** (`docs/plans/2026-07-10-aggregated-live-alarm-stream-plan.md`): the
+  aggregated live gRPC stream shipped as a **transient, in-memory** per-site central live cache
+  (site-wide alarm-only `SubscribeSite` stream, seed-then-stream). The `[PERM]` no-central-store
+  rule is unchanged — the cache persists nothing.
 - **Native-alarm ack / shelve / suppress write-back** — read-only by design, unchanged.
 - **CSV bulk import of native-alarm-source overrides** (`InstanceNativeAlarmSourceOverride`) —
   the T16 importer targets *attribute* overrides only; native-alarm-source CSV is a follow-up.
@@ -102,7 +106,9 @@ M7 adds these verbs on that path (all additive, mirroring `BrowseCommands.cs` +
 - **Reuse:** extract DebugView's inline alarm badge/formatter markup into a shared
   `AlarmStateBadges` component consumed by both DebugView and the summary page.
 - **Refresh:** manual button + optional poll timer (mirrors Health dashboard 10 s). No
-  aggregated live stream in v1.
+  aggregated live stream in v1. *(Aggregated live stream delivered 2026-07-10 —
+  `docs/plans/2026-07-10-aggregated-live-alarm-stream-plan.md`; the poll is now a fallback +
+  `NotReporting` authority behind the transient per-site live cache.)*
 - **Files (indicative):** `Components/Pages/Monitoring/AlarmSummary.razor(.cs)`, a CentralUI
   `IAlarmSummaryService`/impl (fan-out + aggregate), `Components/Shared/AlarmStateBadges.razor`,
   `NavMenu.razor`, Playwright test.