Add guarded bulk database replacement

[RhysSullivan]

Catalog rebuilds need to replace rows only while they still own their rebuild claim. Add a guarded replaceMany operation to Fuma's Drizzle, Kysely, and memory adapters, with parameter-budgeted inserts.

The operation checks the guard's affected-row count before deleting or inserting rows. Transactional adapters roll back a missed guard. Drivers that cannot report an affected-row count fail rather than assume ownership. Adapters without transactions retain the documented weaker cross-writer guarantee; the next layer validates catalog generations before serving them.

Validation: four focused guard tests and the Fuma typecheck passed. This layer contains no catalog schema or MCP changes.

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commit: e3a46ff