Concelier OAS + Observability Prep (2025-11-22)

This prep note was consolidated into the current Concelier documentation set.

Current References

• docs/modules/concelier/operations/observability.md
• docs/modules/concelier/api/observations.md
• docs/modules/concelier/architecture.md

Scope

• OpenAPI surface alignment for observations and linksets.
• Observability contracts and required telemetry for ingestion pipelines.