Initial SQL-only 1C adapter baseline

.gitignore

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+# Secrets
+.env
+.env.*
+!.env.example
+*.key
+*.pem
+*.pfx
+*.p12
+*token*
+*secret*
+
+# Python
+__pycache__/
+.pytest_cache/
+.ruff_cache/
+.mypy_cache/
+.venv/
+venv/
+
+# Runtime state
+data/*.db
+data/*.sqlite
+data/*.sqlite3
+onec-repository-locks.json
+
+# Node
+node_modules/
+dist/
+build/
+
+# Local model and dataset artifacts
+models/
+artifacts/
+checkpoints/
+outputs/
+runs/
+wandb/
+reports/
+*.safetensors
+*.gguf
+*.bin
+*.pt
+*.pth
+*.onnx
+*.ckpt
+*.arrow
+*.parquet
+
+# Large/private datasets are stored outside git.
+datasets/raw/*
+datasets/prepared/*
+plugins/*/datasets/raw/*
+plugins/*/datasets/prepared/*
+plugins/1c/rag/sources/*
+plugins/1c/rag/official-docs/raw/*
+plugins/1c/rag/official-docs/normalized/*
+plugins/1c/rag/official-docs/media/*
+plugins/1c/rag/official-docs/static/*
+plugins/1c/rag/official-docs/.local/*
+plugins/1c/metadata/snapshots/*
+plugins/1c/training/raw/*
+plugins/1c/training/prepared/*
+
+# Keep directory placeholders.
+!datasets/raw/.gitkeep
+!datasets/prepared/.gitkeep
+!plugins/*/datasets/.gitkeep
+!plugins/*/datasets/raw/.gitkeep
+!plugins/*/datasets/prepared/.gitkeep
+!plugins/*/datasets/README.md
+!plugins/1c/rag/sources/.gitkeep
+!plugins/1c/rag/official-docs/raw/.gitkeep
+!plugins/1c/rag/official-docs/normalized/.gitkeep
+!plugins/1c/rag/official-docs/media/.gitkeep
+!plugins/1c/rag/official-docs/static/.gitkeep
+!plugins/1c/rag/official-docs/.local/.gitkeep
+!plugins/1c/metadata/snapshots/.gitkeep
+!plugins/1c/training/raw/.gitkeep
+!plugins/1c/training/prepared/.gitkeep
+
+# OS/editor
+.DS_Store
+Thumbs.db
+.idea/
+.vscode/