Add artifact binding support to the MI worker: introduce ArtifactBinding model and artifactBindings field on MIWorkerTask, validate targets/digests/logicalPath, and apply bindings when creating or recovering sessions. Include JSON Schema (schemas/mi-worker-task-v1.schema.json), an export tool (tools/export_worker_schema.py), and a unit test. Update service logic (mixed_inference/worker/service.py) to resolve RM manifest entries and inject paths into trainingConfig. Also update OpenAPI and docs/READMEs to reflect the RM-managed worker/session API and related conceptual changes.