Supplies a PlcDatabase implementation over a single SQLite file and injects it into the unmodified upstream @did-plc/server, so a dev or preview environment gets a durable did:plc directory without running Postgres alongside it. Validation is unchanged — writes still go through @did-plc/lib's assureValidNextOp for the hash chain, signatures, and rotation-key authority. Only storage differs. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>