fix(scoring): surface snapshot warnings in previews

src/scoring/preview.ts

@@ -203,10 +203,10 @@
   const scenarioPreviews = buildScenarioPreviews(args.input, args.repo, args.snapshot, args.contributorEvidence, current);
   const blockedBy = blockedByFor(args.input, args.repo, current, branchEligibility);
   const gateDeltas = buildGateDeltas(current, scenarioPreviews);
   const effectiveEstimatedScore = current.scoreEstimate.estimatedMergedScore;
   const underlyingPotentialScore = current.scoreEstimate.pendingSaturationScore;
   const scoreabilityStatus = statusFor(args.repo, blockedBy, effectiveEstimatedScore, scenarioPreviews);
-  const warnings = warningsFor(args.input, args.repo, current, branchEligibility);
+  const warnings = [...args.snapshot.warnings, ...warningsFor(args.input, args.repo, current, branchEligibility)];
   const actions = [
     ...(!current.gates.baseTokenGatePassed ? ["Increase meaningful source change size or scope clarity before relying on this preview."] : []),
     ...(current.scoreEstimate.openPrMultiplier === 0 ? ["Land or close existing open PRs before opening more concurrent work."] : []),

test/unit/scoring.test.ts

@@ -111,9 +111,20 @@
       return new Response("not found", { status: 404 });
     });
     const served = await getOrCreateScoringModelSnapshot(env);
     expect(served.warnings.some((warning) => /stale/i.test(warning))).toBe(false);
   });
 
+  it("surfaces snapshot warnings in score previews (#810)", () => {
+    const warning = "Scoring constants snapshot is stale; preview scores may use old constants.";
+    const preview = buildScorePreview({
+      repo,
+      input: { repoFullName: repo.fullName, sourceTokenScore: 10 },
+      snapshot: { ...snapshot, warnings: [warning] },
+    });
+
+    expect(preview.warnings).toContain(warning);
+  });
+
   it("prefers exponential saturation when mixed upstream constants are present", () => {
     const parsed = parsePythonNumberConstants(`
 MERGED_PR_BASE_SCORE = 25