fix(mqtt): initial push of cached snapshots on (re)subscribe — the push-model forceRaise (05/STAB-18 shape b)

archreview/plans/R3-02-stale-good-family-plan.md

@@ -600,3 +600,11 @@ test could only pass once the production change landed.
   ⇒ **build failure**, 8 × `error CS0103: The name 'InputQuality' does not exist in the current context`.
 - GREEN: 13 passed. `Core.ScriptedAlarms.Tests` 94/94 green with `WorstInputStatus` re-pointed (the
   never-pushed/null skips stay in the alarm engine — they are alarm policy, not the shared rule).
+
+### T2 — MQTT plain-mode initial push on `SubscribeAsync`
+
+- RED: `--filter "FullyQualifiedName~MqttSubscriptionManagerRecoveryTests"` ⇒ **4 failed**, each on
+  `raised.Count` (0 observed, 1 expected) / `raised.Select(r => r.Reference)` — `SubscribeAsync` raised
+  nothing at all for an already-observed ref.
+- GREEN: 77 `MqttSubscriptionManager*` tests pass, incl. the suppression control (an identical message
+  after the push is still swallowed). Full `Driver.Mqtt.Tests`: 790/790.

archreview/plans/R3-02-stale-good-family-plan.md.tasks.json

@@ -11,7 +11,7 @@
     {
       "id": "T2",
       "subject": "MQTT plain-mode initial push of cached snapshots on SubscribeAsync — push-model forceRaise (05/STAB-18 shape b)",
-      "status": "pending",
+      "status": "done",
       "blockedBy": []
     },
     {