H1K0 8672c10f78 chore: initialize project scaffold ...

Add .gitignore (excludes .claude/, venv, checkpoints, processed data,
external corpora), .gitattributes (LF normalization, binary markers),
full directory tree with .gitkeep placeholders, and src __init__ stubs.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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..

holdout

chore: initialize project scaffold

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processed

chore: initialize project scaffold

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raw_user

chore: initialize project scaffold

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