Behavior: content-hash deduplication on artifact create

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proposed

parity target Created: 2026-05-24T21:02:43 By: unknown Quality: 50% ✓ SciDEX ID: parity-behavior-content-hash-dedup

▸Metadatacategory: behavior

tier	must_have
notes	Idempotent create: same content_hash → 409, not duplicate row
status	planned
category	behavior
spec_refs	['SPEC-001']
v1_locator	api.py:artifact_create

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