fix(rectification): surface dropped probes and filter tools by the decision

Silent unrenderable discriminators, a missing question-contract golden, and a always-on tool table were hiding fail-closed drops behind the prompt wall.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/lib/rectification-agentic/core/rectification-decision.ts

@@ -13,6 +13,7 @@ import {
   type CandidateSeparation,
 } from "./candidate-separation.ts";
 import { rangeFromTimes } from "./credible-range.ts";
+import type { DroppedProbe } from "../v9/probe-question-contract.ts";
 import type { RectificationPhase, ResultStatus } from "./types.ts";
 
 export type RectificationNextActionType =
@@ -63,6 +64,7 @@ export type RectificationDecision = Readonly<{
   separation: CandidateSeparation;
   probe: CandidateDiscriminatorProbe | null;
   holdoutValidation: HoldoutValidationStatus;
+  droppedProbes: readonly DroppedProbe[];
 }>;
 
 export type DecideRectificationInput = Readonly<{
@@ -192,6 +194,7 @@ function collect(
     separation,
     probe,
     holdoutValidation: holdout,
+    droppedProbes: [],
   };
 }
 
@@ -220,6 +223,7 @@ function discriminate(
     separation,
     probe,
     holdoutValidation: holdout,
+    droppedProbes: [],
   };
 }
 
@@ -246,6 +250,7 @@ function holdoutValidation(
     separation,
     probe: null,
     holdoutValidation: "not_started",
+    droppedProbes: [],
   };
 }
 
@@ -282,6 +287,7 @@ function completeWithRange(
     separation,
     probe: null,
     holdoutValidation: holdout,
+    droppedProbes: [],
   };
 }
 
@@ -329,6 +335,7 @@ function finish(
     separation: input.separation,
     probe: input.probe,
     holdoutValidation: input.holdout,
+    droppedProbes: [],
   };
 }