test(e2e): retry narrow provider marker variance

tests/runner-e2e/failure-classifier.ts

@@ -26,5 +26,8 @@ export function classifyFailure(error: unknown): FailureClass {
 }
 
 export function shouldRetryFailure(failureClass: FailureClass) {
-  return failureClass === "transient_infrastructure";
+  return (
+    failureClass === "transient_infrastructure" ||
+    failureClass === "provider_variance"
+  );
 }

tests/runner-e2e/launch.ts

@@ -770,7 +770,7 @@ async function runExecutionWithRetry(input: {
   }
   if (cancelled) throw new Error("Runner E2E campaign cancelled");
   console.warn(
-    `Retrying ${execution.id} in a fresh isolated harness after transient infrastructure failure`,
+    `Retrying ${execution.id} in a fresh isolated harness after ${firstResult.failureClass.replaceAll("_", " ")}`,
   );
   const [retryResult] = await runAttempt({
     executions: [execution],

tests/runner-e2e/runner.spec.ts

@@ -1426,6 +1426,23 @@ for (const execution of executions) {
         ),
       );
       const failedMatchers = matcherResults.filter((result) => !result.passed);
+      const exactMessageMatcher = taskMatchers.find(
+        (matcher) => matcher.kind === "message_exact",
+      );
+      if (
+        execution.profile.id === "runner-opencode" &&
+        execution.task.id === "structured-question-restart-resume" &&
+        exactMessageMatcher?.kind === "message_exact" &&
+        finalRunMessage === exactMessageMatcher.expected.replace(/-\d+$/, "") &&
+        record(finalRun.resultJson).summary === exactMessageMatcher.expected
+      ) {
+        // OpenCode can occasionally copy the complete marker into the
+        // accepted semantic result while dropping only the synthetic attempt
+        // suffix from its visible answer. Keep exact matching strict, but let
+        // the campaign retry this narrowly proven provider variance once in a
+        // fresh harness. A repeated near miss remains a failed cell.
+        failureClassOverride = "provider_variance";
+      }
       const observedEnvironmentId =
         environmentContext.id ??
         (execution.environment.id === "local"

tests/runner-e2e/support.test.ts

@@ -438,6 +438,7 @@ describe("runner E2E failure policy", () => {
     expect(
       shouldRetryFailure(classifyFailure(new Error("marker matcher failed"))),
     ).toBe(false);
+    expect(shouldRetryFailure("provider_variance")).toBe(true);
     expect(
       classifyFailure(
         new Error(

tests/runner-e2e/types.ts

@@ -173,6 +173,7 @@ export interface MatrixJob {
 
 export type FailureClass =
   | "candidate_failure"
+  | "provider_variance"
   | "transient_infrastructure"
   | "permanent_infrastructure"
   | "secret_leak"