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A shape can follow one convention canon AND call several helper canons; the row's single snippet_id made the 2026-08 audit pick (hash_token won, the service-function convention lost), and hook evidence — pulled a snippet, then wrote code naming it — was stamped as instance when it is a uses fact. - code_shape_uses (migration 0084): shape → snippet, basis, evidence; unique per pair; cascades with both ends. USE_BASES: reference | hook | agent | audit | import. A judgment-grade basis overwrites a mechanical one, never the reverse. - classify_shapes items and classify_shapes_by_rule take uses=[snippet ids] (targets validated like snippet_id; all-or-nothing). - The write-path hook writes a uses edge for every pulled canon the payload names (the instance stamp is unchanged); the proposer writes a uses edge for every canon a body names (reference_canons: kind + language family + stoplist, same rules as the reference basis) — the mechanical form of "auto-confirm own-import references" deferred from #2871. - list_shapes(uses=N) lists the consumers of a canon; get_snippet's consumer map gains `uses` beside instances/variants. Operator decision on #2870 (2026-08-21): keep one snippet_id, add uses edges. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>