Add Hacker News adapter + wire into pipeline

- adapters/hackernews.py: HN Firebase API adapter with AI keyword filtering
- Word-boundary matching to avoid substring traps (Britain/Guinea)
- Score: log(points) + log(comments), actual HN scores
- Wired into ENABLED_SOURCES + verification in pipeline.py
- Live test: 10 AI/ML stories fetched, all clean

pipeline.py

@@ -31,10 +31,11 @@ ADAPTERS = {
     "github": lambda: __import__("adapters.github", fromlist=["GitHubAdapter"]).GitHubAdapter(),
     "arxiv": lambda: __import__("adapters.arxiv", fromlist=["ArxivAdapter"]).ArxivAdapter(),
     "reddit": lambda: __import__("adapters.reddit", fromlist=["RedditAdapter"]).RedditAdapter(),
+    "hackernews": lambda: __import__("adapters.hackernews", fromlist=["HackerNewsAdapter"]).HackerNewsAdapter(),
 }
 
 # Default enabled sources
-ENABLED_SOURCES = ["github", "arxiv", "reddit"]
+ENABLED_SOURCES = ["github", "arxiv", "reddit", "hackernews"]
 
 
 def init_db(db_path: str, schema_path: str) -> sqlite3.Connection:
@@ -144,6 +145,27 @@ def verify_entries(conn: sqlite3.Connection, source: str, sample_size: int = 3):
                 except Exception as e:
                     print(f"  ? [{eid}] {title[:60]}... verify failed: {e}")
 
+        elif src == "hackernews":
+            hn_id = meta.get("id", "")
+            if hn_id:
+                try:
+                    req = urllib.request.Request(
+                        f"https://hacker-news.firebaseio.com/v0/item/{hn_id}.json",
+                        headers={"User-Agent": "ai-oracle/0.1"},
+                    )
+                    with urllib.request.urlopen(req, timeout=10) as resp:
+                        live = json.loads(resp.read().decode("utf-8"))
+                    live_score = live.get("score", 0)
+                    db_score = meta.get("score", 0)
+                    drift = abs(live_score - db_score)
+                    if drift <= 20:
+                        print(f"  ✓ [{eid}] {title[:60]}... hn_score={db_score} drift={drift}")
+                        passed += 1
+                    else:
+                        print(f"  ? [{eid}] {title[:60]}... hn_score={db_score} vs live={live_score} DRIFT={drift}")
+                except Exception as e:
+                    print(f"  ? [{eid}] {title[:60]}... verify failed: {e}")
+
         elif src == "reddit":
             # For Reddit, just check the URL is reachable (no easy verification of scores via RSS)
             if url: