Define wpdb named-column retirement contract - #42
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Implements the optional named-column retirement capability for the WordPress adapter while preserving the corrected #41 protected extension surface and making ordinary sync additive. The official-wpdb strategy resolves both base and retirement interfaces to one configured instance. Requested and declared names use the backend metadata identifier collation even when a declared column is absent; aliases deduplicate to one persisted target. Full preflight validates the complete batch, rejects malformed metadata, and refuses declared columns, index dependencies, unresolved functional-index metadata, and foreign keys before DDL.
Persisted official-wpdb/MySQL 8.0.45 fixtures cover active-schema scoping, absent declared ASCII/Unicode case variants, the distinct legacy/légacy accent boundary, additive sync, mixed present/absent retirement, deduplication/idempotence, invalid-batch atomicity, quoted identifiers, preserved data, and dependency guards. Unit boundary fixtures honor requested COLUMN_NAME and identifier-comparison predicates without weakening assertions.
This PR is based on corrected #41 head c98c432 and preserves its official WordPress bootstrap, query contracts, protected APIs, and dual optional/required integration scripts. Temporary dependency files resolve phpnomad/db#38 at 406843bc0eefeeadc6fecb847f6e9f3b596458a5 through the branch alias over HTTPS. Release sequence: land/release DB #38 and replace the temporary alias with the released constraint, land #41, then merge/release this adapter. No tag or release is created here.
Architecture: Named Table Column Retirement Contract (Source 9972)