Add SearXNG news collector merged into the briefing pipeline

Optional meta-search source (SEARXNG_BASE_URL): per-query isolation,
time_range=day, merged and deduplicated with the RSS feeds. Briefings
still publish on RSS alone if the instance is down.

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

us2kr/pipeline.py

@@ -16,8 +16,9 @@ from pydantic import BaseModel
 
 from us2kr.collectors.base import run_safely
 from us2kr.collectors.events import fetch_earnings, fetch_events
-from us2kr.collectors.news import fetch_news
+from us2kr.collectors.news import dedup_news, fetch_news
 from us2kr.collectors.prices import fetch_quotes
+from us2kr.collectors.searx import fetch_searx_news
 from us2kr.config import KST, Settings
 from us2kr.deliver import build_deliverers
 from us2kr.llm.base import LLMError
@@ -79,6 +80,20 @@ def build_payload(session: date, settings: Settings, clock: MarketClock, store:
     news = run_safely(
         "news", lambda: fetch_news(since=news_since, max_items=settings.news_max_items), [], gaps
     )
+    if settings.searxng_base_url:
+        searx_news = run_safely(
+            "searxng",
+            lambda: fetch_searx_news(
+                settings.searxng_base_url,  # type: ignore[arg-type]
+                since=news_since,
+                queries=settings.searxng_queries or None,
+            ),
+            [],
+            gaps,
+        )
+        if searx_news:
+            # RSS first so it wins timestamp ties in dedup; cap stays at news_max_items overall.
+            news = dedup_news([*news, *searx_news])[: settings.news_max_items]
     events = run_safely("events", lambda: fetch_events(session, settings.fred_api_key), [], gaps)
     tickers = earnings_tickers()
     earnings = run_safely("earnings", lambda: fetch_earnings(session, tickers), [], gaps)