docs: ADR-0035 — record two /runda refinements (IF [NOT] EXISTS, INTEGER PRIMARY KEY)

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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