Phase 4 hardening: dealer-gamma + liquidation-heatmap entry filters

Integra due nuovi filtri dal pacchetto quant indicators rilasciato in
Cerbero_mcp (commit a13e3fe). 335 test pass, mypy strict pulito,
ruff clean.

Filtri (§2.8 — nuovo):
- dealer-gamma: blocca entry quando total_net_dealer_gamma <
  dealer_gamma_min (default 0). Long-gamma regime favorisce credit
  spread (vol-suppressing dealer flow); short-gamma flow lo amplifica
  ed è da evitare.
- liquidation-heatmap: blocca entry quando il segnale euristico di
  cerbero-sentiment riporta long o short squeeze risk = "high"
  (cluster di liquidations imminenti entro 24h).

Entrambi sono best-effort: se il tool MCP fallisce o restituisce
dati anomali l'entry_cycle popola EntryContext con None e
validate_entry salta il gate per non bloccare entry su problemi
infrastrutturali.

Wrapper:
- DeribitClient.dealer_gamma_profile_eth → DealerGammaSnapshot.
- SentimentClient.liquidation_heatmap → LiquidationHeatmap con
  property has_high_squeeze_risk.

Schema:
- EntryConfig.dealer_gamma_min, dealer_gamma_filter_enabled,
  liquidation_filter_enabled.
- EntryContext.dealer_net_gamma, liquidation_squeeze_risk_high
  opzionali.
- strategy.yaml: nuovi campi documentati con commento + hash
  ricalcolato (4c2be4c5...).

Documentazione:
- docs/04-mcp-integration.md riscritto al modello attuale (HTTP
  REST, no mcp SDK, no memory/brain-bridge, place_combo_order
  documentato, environment_info al boot).

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

tests/unit/test_clients_deribit.py

@@ -333,6 +333,35 @@ async def test_get_positions_returns_list(httpx_mock: HTTPXMock) -> None:
 # ---------------------------------------------------------------------------
 
 
+@pytest.mark.asyncio
+async def test_dealer_gamma_profile_eth_parses_payload(httpx_mock: HTTPXMock) -> None:
+    httpx_mock.add_response(
+        url="http://mcp-deribit:9011/tools/get_dealer_gamma_profile",
+        json={
+            "currency": "ETH",
+            "spot_price": 3000.0,
+            "by_strike": [],
+            "total_net_dealer_gamma": 12345.6,
+            "gamma_flip_level": 2950.5,
+            "strikes_analyzed": 18,
+        },
+    )
+    snap = await _client().dealer_gamma_profile_eth()
+    assert snap.spot_price == Decimal("3000.0")
+    assert snap.total_net_dealer_gamma == Decimal("12345.6")
+    assert snap.gamma_flip_level == Decimal("2950.5")
+    assert snap.strikes_analyzed == 18
+
+
+@pytest.mark.asyncio
+async def test_dealer_gamma_profile_anomaly_when_total_missing(
+    httpx_mock: HTTPXMock,
+) -> None:
+    httpx_mock.add_response(json={"spot_price": 3000.0})
+    with pytest.raises(McpDataAnomalyError, match="missing spot_price or total"):
+        await _client().dealer_gamma_profile_eth()
+
+
 def test_deribit_client_rejects_wrong_service() -> None:
     bad = HttpToolClient(
         service="macro", base_url="http://x:1", token="t", retry_max=1