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

sentiment_engine/config/asset_aliases.yaml

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+# Asset alias mappings - maps common aliases to canonical tickers
+aliases:
+  # Major crypto
+  "BTC": "BTC"
+  "BITCOIN": "BTC"
+  "XBT": "BTC"
+  
+  "ETH": "ETH"
+  "ETHEREUM": "ETH"
+  "ETHER": "ETH"
+  
+  "SOL": "SOL"
+  "SOLANA": "SOL"
+  
+  "BNB": "BNB"
+  "BINANCE": "BNB"
+  
+  "ADA": "ADA"
+  "CARDANO": "ADA"
+  
+  "XRP": "XRP"
+  "RIPPLE": "XRP"
+  
+  "DOGE": "DOGE"
+  "DOGECOIN": "DOGE"
+  
+  "MATIC": "MATIC"
+  "POLYGON": "MATIC"
+  
+  "AVAX": "AVAX"
+  "AVALANCHE": "AVAX"
+  
+  "DOT": "DOT"
+  "POLKADOT": "DOT"
+  
+  "LINK": "LINK"
+  "CHAINLINK": "LINK"
+  
+  "UNI": "UNI"
+  "UNISWAP": "UNI"
+  
+  "AAVE": "AAVE"
+  "ARB": "ARB"
+  "ARBITRUM": "ARB"
+  "OP": "OP"
+  "OPTIMISM": "OP"
+  
+  # People aliases
+  "VITALIK": "ETH"
+  "VITALIK BUTERIN": "ETH"
+  "CZ": "BNB"
+  "CHANGPENG ZHAO": "BNB"
+  "ELON": "DOGE"
+  "ELON MUSK": "DOGE"
+  "SAYLOR": "BTC"
+  "MICHAEL SAYLOR": "BTC"
+  "SBF": "SOL"  # Historical
+  
+  # Stablecoins
+  "USDT": "USDT"
+  "TETHER": "USDT"
+  "USDC": "USDC"
+  "CIRCLE": "USDC"
+  "DAI": "DAI"
+  "MAKER": "MKR"
+  
+  # Meme/Other
+  "SHIB": "SHIB"
+  "SHIBA": "SHIB"
+  "PEPE": "PEPE"
+  "WIF": "WIF"
+  "BONK": "BONK"