docs: tighten ReceiptAgent evidence boundaries

#1

Distinguish owner-signed receipt integrity from independent validation, remove universal behavior claims, disclose unpublished curriculum files, add exact uploaded-weight LFS hashes, and label the small synthetic evaluation honestly.

Merged after UTF-8/card-metadata validation, receipt signature and chain verification, exact Hub LFS hash comparison, and 22/22 link probes passing across the three-card wave.

betterwithage changed pull request status to merged

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