fix(data,protocol): paginazione OHLCV + macd accetta signal param

Run reale phase1-real-002 ha rivelato:

1. Cerbero/Deribit cap ~5000 candele per call. Una richiesta di 2 anni
   1h (17500 candele) ritorna troncata. CerberoOHLCVLoader._fetch ora
   pagina in chunk da 4500 barre, concatena e dedupe.

2. _ind_macd accettava solo (df, fast, slow). Il prompt suggerisce
   "(indicator macd 12 26 9)" con 3 numeri (fast/slow/signal). Aggiunto
   signal=9 default e calcolo histogram (macd_line - signal_line).

Test suite 122 PASSED, ruff e mypy clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/multi_swarm/data/cerbero_ohlcv.py

@@ -19,16 +19,15 @@ the three plausible shapes (object-of-records under ``candles``/``data``/
 ``result``/``ohlcv``/``klines``/``bars``, array-of-arrays ccxt-style, or
 a raw list at the top level) and raises a clear error if none matches.
 
-Pagination is NOT yet implemented — Cerbero is assumed to accept the full
-date range and page internally. If a future live call shows a cap (e.g.
-~1000 candles per call), add a chunked fetch in a follow-up.
+Cerbero/Deribit applicano un cap soft di ~5000 candele per call: il
+loader pagina internamente in chunk da 4500 barre, concatena e dedupe.
 """
 
 from __future__ import annotations
 
 import hashlib
 from dataclasses import dataclass
-from datetime import datetime
+from datetime import datetime, timedelta
 from pathlib import Path
 from typing import Any, ClassVar
 
@@ -73,10 +72,38 @@ class CerberoOHLCVLoader:
         df.to_parquet(cache_file)
         return df
 
+    # Cerbero/Deribit hanno un cap soft di ~5000 candele per call.
+    # Paginiamo in chunk piu' piccoli per intervalli lunghi.
+    _CHUNK_BARS: ClassVar[int] = 4500
+
     def _fetch(self, req: OHLCVRequest) -> pd.DataFrame:
-        args = self._build_args(req)
-        response = self.client.call_tool(req.exchange, "get_historical", args)
-        return self._parse_response(response)
+        bar_seconds = _timeframe_to_minutes(req.timeframe) * 60
+        chunk_seconds = self._CHUNK_BARS * bar_seconds
+        chunks: list[pd.DataFrame] = []
+        cursor = req.start
+        while cursor < req.end:
+            chunk_end = min(req.end, cursor + timedelta(seconds=chunk_seconds))
+            chunk_req = OHLCVRequest(
+                symbol=req.symbol, timeframe=req.timeframe,
+                start=cursor, end=chunk_end, exchange=req.exchange,
+            )
+            args = self._build_args(chunk_req)
+            response = self.client.call_tool(req.exchange, "get_historical", args)
+            chunk = self._parse_response(response)
+            if not chunk.empty:
+                chunks.append(chunk)
+                last_ts = chunk.index[-1].to_pydatetime()
+                # avanza di un bar oltre l'ultimo per evitare overlap
+                cursor = max(last_ts + timedelta(seconds=bar_seconds), chunk_end)
+            else:
+                cursor = chunk_end
+        if not chunks:
+            return pd.DataFrame(columns=self._COLUMNS).set_index(
+                pd.DatetimeIndex([], tz="UTC", name="ts")
+            )
+        df = pd.concat(chunks)
+        df = df[~df.index.duplicated(keep="first")].sort_index()
+        return df
 
     def _build_args(self, req: OHLCVRequest) -> dict[str, Any]:
         if req.exchange == "deribit":