Add sentiment_engine with CryptoSentimentCalibrator fixes - improved keyword lists, lowered FinBERT threshold, added neutral handling

sentiment_engine/config/known_entities.yaml

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+# Known entities with contract addresses and metadata
+entities:
+  BTC:
+    name: "Bitcoin"
+    type: "crypto"
+    chain: "bitcoin"
+    contracts: []
+    market_cap_rank: 1
+  
+  ETH:
+    name: "Ethereum"
+    type: "crypto"
+    chain: "ethereum"
+    contracts: ["0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"]  # WETH
+    market_cap_rank: 2
+  
+  SOL:
+    name: "Solana"
+    type: "crypto"
+    chain: "solana"
+    contracts: ["So11111111111111111111111111111111111111112"]
+    market_cap_rank: 5
+  
+  BNB:
+    name: "BNB"
+    type: "crypto"
+    chain: "bsc"
+    contracts: ["0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c"]  # WBNB
+    market_cap_rank: 4
+  
+  USDT:
+    name: "Tether USD"
+    type: "stablecoin"
+    chain: "ethereum"
+    contracts: ["0xdAC17F958D2ee523a2206206994597C13D831ec7"]
+    market_cap_rank: 3
+  
+  USDC:
+    name: "USD Coin"
+    type: "stablecoin"
+    chain: "ethereum"
+    contracts: ["0xA0b86a33E6441b8C4C8C8C8C8C8C8C8C8C8C8C8C8"]  # placeholder
+    market_cap_rank: 6
+  
+  MATIC:
+    name: "Polygon"
+    type: "crypto"
+    chain: "polygon"
+    contracts: ["0x0000000000000000000000000000000000001010"]
+    market_cap_rank: 15
+  
+  ARB:
+    name: "Arbitrum"
+    type: "crypto"
+    chain: "arbitrum"
+    contracts: []
+    market_cap_rank: 35
+  
+  OP:
+    name: "Optimism"
+    type: "crypto"
+    chain: "optimism"
+    contracts: []
+    market_cap_rank: 40
+  
+  UNI:
+    name: "Uniswap"
+    type: "defi"
+    chain: "ethereum"
+    contracts: ["0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984"]
+    market_cap_rank: 20
+  
+  AAVE:
+    name: "Aave"
+    type: "defi"
+    chain: "ethereum"
+    contracts: ["0x7Fc66500c84A76Ad7e9c93437bFc5Ac33E2DDaE9"]
+    market_cap_rank: 50
+  
+  LINK:
+    name: "Chainlink"
+    type: "oracle"
+    chain: "ethereum"
+    contracts: ["0x514910771AF9Ca656af840dff83E8264EcF986CA"]
+    market_cap_rank: 18