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

sentiment_engine/.gitignore

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+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+venv/
+env/
+ENV/
+.env
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+logs/
+
+# Data
+data/
+*.parquet
+*.npz
+
+# Model cache
+~/.cache/huggingface/
+~/.cache/torch/
+
+# ClickHouse
+clickhouse-data/
+
+# NATS
+nats-data/
+
+# Hazelcast
+hazelcast-data/
+
+# Prefect
+prefect-data/
+
+# LatticeDB
+latticedb-data/
+
+# Centroids (generated)
+config/centroids/
+
+# Test output
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Docker
+.docker/