feat: min_score anti-rumore nella ricerca + igiene metadata

- gateway v2.2.0: SearchIn.min_score → score_threshold a livello Qdrant (filtra sotto soglia), audit e risposta con min_score
- estensione v1.2.0: qmem_search con min_score default 0.45 (guida punteggi in descrizione), marker ⚠️ per score<0.60, messaggio dedicato quando 0 risultati rilevanti
- dati: eliminato record rumore ('valuta preferita EUR'), assegnati project_id mancanti via supersede (domotics, pi-qmem x2, agy-pi)
- AGENTS.md: sezione interpretazione punteggi

gateway/main.py

@@ -48,7 +48,7 @@ MAX_TEXT_LEN = int(os.environ.get("MAX_TEXT_LEN", "8000"))
 logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")
 log = logging.getLogger("memory-gateway")
 
-app = FastAPI(title="Memory Gateway", version="2.1.0")
+app = FastAPI(title="Memory Gateway", version="2.2.0")
 qdrant = QdrantClient(url=QDRANT_URL, api_key=QDRANT_API_KEY)
 
 # Rate limit in-memory: {key: [timestamps]}
@@ -76,6 +76,7 @@ class SearchIn(BaseModel):
     project_id: Optional[str] = None
     scope: Optional[Literal["agent", "project", "org"]] = None
     include_superseded: bool = False
+    min_score: Optional[float] = Field(default=None, ge=0.0, le=1.0)
     top_k: int = Field(default=5, ge=1, le=20)
 
 
@@ -228,6 +229,7 @@ async def search_memories(body: SearchIn, key: str = Depends(require_auth)) -> d
         query_vector=vector,
         query_filter=qm.Filter(must=must) if must else None,
         limit=body.top_k,
+        score_threshold=body.min_score,  # filtra a livello motore: sotto soglia = rumore
         with_payload=True,
     )
     results = [
@@ -247,8 +249,8 @@ async def search_memories(body: SearchIn, key: str = Depends(require_auth)) -> d
         }
         for h in hits
     ]
-    _audit(key, "search", query=body.query[:80], top_k=body.top_k, hits=len(results))
-    return {"results": results}
+    _audit(key, "search", query=body.query[:80], top_k=body.top_k, min_score=body.min_score, hits=len(results))
+    return {"results": results, "min_score": body.min_score, "total_hits": len(results)}
 
 
 @app.get("/v1/memories/{memory_id}")