Concept registry

Concept ID	Provider responsibility
CONCEPT:PL-OS.identity.pngx	Typed document and metadata operations through the current Agent Utilities MCP boundary
CONCEPT:PL-OS.governance.pngx	Search, task, status, schema, and privacy-preserving structural ingestion operations
CONCEPT:AU-KG.ingest.enterprise-source-extractor	Provider projection into the central governed ChangeEnvelope path
CONCEPT:AU-ECO.messaging.native-backend-abstraction	Data-only provider discovery through ecosystem entry points

The provider uses the single current CONCEPT:PL-* prefix. No retired concept identifiers or parallel names are accepted.