chore: initial project scaffolding and gitignore

.gitignore

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+.venv/
+venv/
+__pycache__/
+*.pyc
+.env
+.cache/
+output/
+*.sqlite
+*.sqlite3

README.md

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+# HIFFI Top 500 Hip-Hop Artist Intelligence
+
+Automated data pipeline for multi-source verification and composite metric ranking.