19d3cd3306b9d696395e28e2bcca18e7c5a1c465
Pre-implementation /runda round settled two open micro-calls before 4a, both user-confirmed: - IF [NOT] EXISTS admitted (no-op-that-succeeds-with-a-note), not refused — a near-universal cross-vendor idiom (PostgreSQL, MySQL, SQLite, Oracle 23ai), reclassified into scope rather than treated as an engine-specific spelling. Touches §3/§4/§12/§13 (4a, 4c). - INTEGER PRIMARY KEY maps to a plain int PK, not auto-increment; serial stays the sole auto-increment type (§3). README index updated in the same edit per the lockstep rule.
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