Add a Monday-morning weekly recap briefing

No US session closes into Monday KST, so Mondays (default 07:00, cron
in the daemon with restart catch-up) now publish a weekly review built
entirely from stored data: the quotes table collapsed into week-over-
week changes and the week's daily briefing headlines as the narrative.
The recap is a BriefingResult kind="weekly" reusing MarketPayload, so
the store, verification pass, all delivery channels (Blogger title
"미국 주간 리뷰 <monday>") and the dashboard (주간 리뷰 badge) work
unchanged. Manual runs via `run-once --weekly [--date <monday>]`.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

us2kr/deliver/blogger.py

@@ -54,11 +54,12 @@ def briefing_html(markdown_text: str) -> str:
 
 def post_title_prefix(result: BriefingResult) -> str:
     """Stable per-day prefix - resends update the existing post instead of creating a duplicate."""
-    return f"미국 마감 브리핑 {result.payload.krx_date.isoformat()}"
+    label = "미국 주간 리뷰" if result.kind == "weekly" else "미국 마감 브리핑"
+    return f"{label} {result.payload.krx_date.isoformat()}"
 
 
 def post_title(result: BriefingResult) -> str:
-    """'미국 마감 브리핑 YYYY-MM-DD — 헤드라인' (falls back to the session date without a report)."""
+    """'{prefix} — 헤드라인' (falls back to the session date without a report)."""
     base = post_title_prefix(result)
     headline = (result.report.headline or "").strip() if result.report else ""
     return f"{base} — {headline}" if headline else f"{base} (미 {result.payload.session_date.isoformat()} 세션)"