Enumerate failing specs/E2E from CI artifacts; mute all github-actions comments

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DgBEW6qAwgn2fcQbA2f4ZQ

shared/types.ts

@@ -68,12 +68,32 @@ export interface TimelineEvent {
   inReplyTo: { actor: string; bodyExcerpt: string } | null;
 }
 
+export interface SpecFailure {
+  path: string;
+  line: number | null;
+  name: string;
+  message: string;
+}
+
+export interface FailureReportSummary {
+  key: string;
+  label: string;
+  failed: number;
+  truncated: boolean;
+}
+
+export interface FailureReport extends FailureReportSummary {
+  fetchedAt: string;
+  failures: SpecFailure[];
+}
+
 export interface StatePayload {
   prs: PrSnapshot[];
   lastSyncAt: string | null;
   lastSyncError: string | null;
   unreadCountsByPr: Record<string, number>;
   unreadTotal: number;
+  failuresByPr: Record<string, FailureReportSummary[]>;
 }
 
 export interface TimelinePage {