feat(report): drop the report sky cover; docs, checklist and progress for M1–M5 (M5+M3)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

frontend/src/app/api/reports/[reportId]/route.ts

@@ -18,8 +18,6 @@ import { createSupabasePersonalReportJobService } from "@/lib/personal-report-jo
 import { createPersonalReportSectionService } from "@/lib/personal-report-section-service";
 import { isSupabaseConfigurationError } from "@/lib/supabase/config";
 import { createServerSupabaseClient } from "@/lib/supabase/server";
-import { subjectBirthFingerprint } from "@/lib/report-birth-binding";
-import { loadSubjectBirth } from "@/lib/subject-birth";
 
 export const runtime = "nodejs";
 
@@ -51,7 +49,6 @@ async function resolvePersistenceForUser() {
       jobs: null,
       listSections: undefined,
       loadLongformAppendix: undefined,
-      loadCurrentBirthFingerprint: undefined,
     };
   }
   const persistence = createSupabasePersonalReportService(supabase);
@@ -87,17 +84,12 @@ async function resolvePersistenceForUser() {
         markdown: row.markdown,
       };
     },
-    // Report cover binding: the same stored-row fingerprint the chart page uses.
-    // A foreign, deleted or unreadable subject throws and resolves to no cover.
-    loadCurrentBirthFingerprint: async (ownerId: string, subjectId: string) => (
-      subjectBirthFingerprint((await loadSubjectBirth(supabase, ownerId, subjectId)).row)
-    ),
   };
 }
 
 export async function GET(request: Request, context: RouteContext) {
   try {
-    const { userId, persistence, jobs, listSections, loadLongformAppendix, loadCurrentBirthFingerprint } = await resolvePersistenceForUser();
+    const { userId, persistence, jobs, listSections, loadLongformAppendix } = await resolvePersistenceForUser();
     const { reportId } = await context.params;
     if (!uuidPattern.test(reportId)) {
       return NextResponse.json(
@@ -124,7 +116,6 @@ export async function GET(request: Request, context: RouteContext) {
       jobs: jobs ?? undefined,
       listSections,
       loadLongformAppendix,
-      loadCurrentBirthFingerprint,
       validateReadyDocument: (document) => {
         const parsed = safeParseServerReportDocument(document);
         return parsed.ok