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

sentiment_engine/docker/.dockerignore

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+# Git
+.git/
+.gitignore
+
+# Python
+__pycache__/
+*.py[cod]
+*.so
+.Python
+build/
+dist/
+*.egg-info/
+
+# Virtual environments
+venv/
+env/
+
+# IDE
+.vscode/
+.idea/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Logs
+*.log
+logs/
+
+# Data
+data/
+*.parquet
+*.npz
+
+# Model cache
+~/.cache/
+
+# Test output
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Config secrets
+.env
+config/*.local.yaml
+
+# Documentation
+README.md
+docs/
+
+# Tests
+tests/
+scripts/
+
+# Prefect flows (copied separately)
+prefect_flows/