[11.0][A3] Remove deprecated IDataEngine interface (use IDataDriver)

[os-zhuang]

Part of 11.0 breaking-change batch (#2364).

Remove the deprecated IDataEngine interface — the old name for IDataDriver. (Owner decision: remove in 11.0, not deferred to v12.)

Scope

• Defined in packages/spec/src/contracts/data-engine.ts (+ re-export in packages/core/src/contracts/data-engine.ts).
• ~271 typed references — narrow change, wide blast radius. Every : IDataEngine / implements IDataEngine / import { IDataEngine } switches to IDataDriver:
  • packages/objectql/src/engine.ts (ObjectQL implements IDataEngine)
  • packages/plugins/plugin-auth/src/objectql-adapter.ts (3 signatures)
  • packages/plugins/plugin-audit/src/audit-writers.ts (re-export)
  • spec/core contract barrels

Checklist

• Replace all IDataEngine usages with IDataDriver
• Remove the IDataEngine export from spec + core contracts
• Full-repo tsc typecheck (catches any missed ref)
• gen:api-surface + commit snapshot
• major changeset

Risk: low (pure type rename, no behavior change) but wide — miss one ref → typecheck red.

[os-zhuang]

Scope correction (implemented in #2384). On inspection, IDataEngine is not deprecated — it's the live engine-layer contract (ObjectQL implements IDataEngine, 60 refs). The genuine @deprecated alias is DriverInterface (= IDataDriver). #2384 removes DriverInterface (spec/contracts + core re-export), migrates objectql/engine.ts to IDataDriver (type-identical), and regenerates api-surface. IDataEngine stays; the separate zod DriverInterface/DriverInterfaceSchema in spec/data also stays. Verified: spec 32 + objectql 718 green.