fix(calculation): hold evaluation on Bad inputs and propagate the worst input status; status-keyed dedup (05/STAB-19)

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

@@ -741,3 +741,20 @@ test could only pass once the production change landed.
 - GREEN: 11 passed (`DependencyConsumerMuxAdapterTests` + `DependencyMuxActorTests`).
 - The false "quality is stripped at the mux boundary" comment is deleted and replaced with why it was
   false (theme 6: the contract moved at #478/#519 and the comment outlived the fact).
+
+### T13 — `CalculationDriver` input quality (hold on Bad, propagate worst, status-keyed dedup)
+
+- RED: `--filter "…CalculationDriverInputQualityTests"` ⇒ **5 failed**: `Snapshot.StatusCode should be
+  2150694912u` (BadNoCommunication) on the Bad-input, cold-start and passthrough cases; `should be
+  1073741824u` (Uncertain) on the Uncertain case; `published.Count should be 1` on the sub-code-change
+  case. That is the laundering, reproduced from three directions.
+- GREEN: whole `Driver.Calculation.Tests` project 61/61 — the 9 new plus every pre-existing case
+  unchanged (the Good-only paths are byte-identical).
+- **Vacuity check performed** (the plan's requirement): reverting the dedup key to value-only
+  (`if (st.HasValue && Equals(st.LastValue, value)) return null;`) ⇒
+  `An_identical_value_is_republished_when_recovering_from_a_bad_input` **FAILED** with
+  `published.Count should be 1` — i.e. the recovery was swallowed, exactly the "Bad forever" trap.
+  Restored, green.
+- `TagState.LastPublishedBad` (two-state) became `HasPublished` + `LastPublishedStatus` (uint), which is
+  what lets a Bad→different-Bad transition republish and what makes `ReadAsync` agree with the
+  subscriber. The evaluator is still handed bare values here — T14 hands it the snapshots.

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

@@ -93,7 +93,7 @@
     {
       "id": "T13",
       "subject": "CalculationDriver input quality: snapshots per dep, hold on Bad, publish worst-of-input once per status change, status-keyed dedup bypass on recovery, ReadOne parity",
-      "status": "pending",
+      "status": "done",
       "blockedBy": [
         "T1",
         "T12"