216e7ba61b934fe99a1cccf62da94a14091bf259
Handoff-12 §2.2: the DDL TABLE_NAME_EXISTING slot and the relationship-endpoint table idents didn't set writes_table, so column-name slots downstream (drop/rename/change column; relationship qualified columns) couldn't narrow to the active table — candidates leaked from every table. Set writes_table: true on TABLE_NAME_EXISTING and on DR_PARENT/DR_CHILD/AR_PARENT/AR_CHILD table idents. The deliberately-documenting completion test now asserts per-table narrowing.
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