fix(rectification): offer/compare model views drop audit-only fields (R1, BUG-593 side path)

T5 of TASK-rectification-grounding-20260927.
- rectification-offer-candidates returned the full projection (~100 KB on the
  public AA case: *_pre_inference, 31 KB contrast packet, probe lists). It now
  returns the compare stripping (offerModelProjection); 100,012 → 28,799 bytes.
- agentVisibleLatestProjection also drops engine_indistinguishable_width_minutes
  (audit-only since BUG-593), keeps the verification Markdown once
  (skill_verification_report; range_delivery.verification_markdown was a
  byte-identical copy) and shows the slim candidate list.
- Receipt fingerprints stay over the full payloads; the case API projection
  (latestResultToolProjection) is unchanged.
Contract tests on a real local engine response (public AA chart).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017eEAG8HD3mm8gsKXgk8uU8

frontend/src/mastra/rectification-v9-tools.ts

@@ -114,7 +114,7 @@ import {
   publicEvidenceItemStatus,
   resolveEvidenceQuote,
 } from "@/lib/rectification-agentic/v9/evidence-quote";
-import { projectTurnDecision } from "@/lib/rectification-agentic/v9/turn-decision";
+import { modelVisibleInference, projectTurnDecision } from "@/lib/rectification-agentic/v9/turn-decision";
 import {
   contrastPacketFromLatestResult,
   decideFromDossier,
@@ -624,8 +624,16 @@ function agentVisibleLatestProjection(
     representative_time_pre_inference: _preTime,
     house_table_pre_inference: _preHouse,
     natal_recast_pre_inference: _preNatal,
+    // R1 (TASK-rectification-grounding-20260927): the engine's own width is
+    // audit-only (BUG-593); the report width is skill_verification_report.
+    engine_indistinguishable_width_minutes: _engineWidth,
     ...rest
   } = projection;
+  // R1: the verification Markdown is kept once, in skill_verification_report;
+  // range_delivery carried a byte-identical copy.
+  const rangeDelivery = rest.range_delivery && typeof rest.range_delivery === "object" && !Array.isArray(rest.range_delivery)
+    ? (({ verification_markdown: _markdown, ...delivery }) => delivery)(rest.range_delivery as Record<string, unknown>)
+    : rest.range_delivery;
   const currentQuestion = extras.openQuestion
     ? extras.openQuestion.unrenderable === true
       ? {
@@ -647,13 +655,15 @@ function agentVisibleLatestProjection(
         probe_id: extras.openQuestion.probe_id,
       }
     : null;
+  // BUG-1057: the same slim candidate list the read-case shows.
   const compactInference = inference && typeof inference === "object" && !Array.isArray(inference)
-    ? inference as Record<string, unknown>
+    ? modelVisibleInference(inference as Record<string, unknown>)
     : null;
   const renderableChoice = extras.openQuestion?.kind === "choice"
     && extras.openQuestion.unrenderable !== true;
   return {
     ...rest,
+    ...(rangeDelivery !== undefined ? { range_delivery: rangeDelivery } : {}),
     current_question: currentQuestion,
     current_probe: null,
     inference_state: renderableChoice && compactInference
@@ -675,6 +685,17 @@ function agentVisibleLatestProjection(
   };
 }
 
+/**
+ * What rectification-offer-candidates hands the model (R1): the compare
+ * stripping applied to the offer payload. No open question rides on an offer.
+ */
+export function offerModelProjection(payload: Record<string, unknown>): Record<string, unknown> {
+  return agentVisibleLatestProjection(payload, {
+    openQuestion: null,
+    focusStatus: "not_applicable",
+  });
+}
+
 function followupPlanForParsed(
   parsed: DossierForTools,
   latest: DossierForTools["latestResult"],
@@ -2202,7 +2223,11 @@ export function createRectificationV9Tools(ctx: RectificationV9Context) {
           inputFingerprint,
           resultFingerprint: hashResult(payload),
         });
-        return payload;
+        // R1 (BUG-593 side path): the model gets the same stripped projection
+        // compare returns — no *_pre_inference, contrast packet, probes,
+        // duplicate report Markdown or engine width. The receipt fingerprint
+        // above stays over the full payload.
+        return offerModelProjection(payload);
       } catch (error) {
         await failReceipt("rectification-offer-candidates", "candidates.updated", error, { inputFingerprint });
         throw error;