docs: ADR-0035 — advanced-mode SQL DDL (Phase 4)

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Phase 4 of the ADR-0030 roadmap; clarifies §4. Advanced-mode
CREATE/DROP/ALTER TABLE + CREATE/DROP INDEX get their own
per-statement Sql* commands, executed structurally (not verbatim)
so the playground's types, named relationships, and STRICT stay
intact. Full surface (no pre-emptive cuts): constraints, compound
PK, FK -> named relationships (one statement = one undo step),
ALTER incl. advanced-only table rename (C1), [UNIQUE] indexes.
Unified column-type-conversion: lossy refuses in simple mode but
proceeds-with-a-note in advanced, with undo as the safety net.
Integration (parser/hint/completion/diagnostics/history/replay/undo)
is structural via the unified grammar; replay treats DDL as a write.
Nine sub-phases (4a-4i). Updates the ADR README index.

Status: Proposed (design agreed; implementation pending).

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