6429b564439071d6d42932a2adc384820f3c849e
Per-form hints for the schema-shaping commands: create table, create m:n, add column/index/constraint, drop table/column/relationship/ index/constraint, rename column, change column (add_relationship was the Phase-B exemplar). Examples verified against the canonical usage templates. hint_ids wired on CREATE/CREATE_M2N/DROP/RENAME/CHANGE; catalogue + keys.rs registered. +2 spot tests (incl. multi-form DROP disambiguation); 2491 pass / 1 ignored, clippy clean.
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