prep docs and service updates

docs/modules/telemetry/prep/2025-11-20-obs-50-002-prep.md

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+# Telemetry Context Propagation Prep — PREP-TELEMETRY-OBS-50-002
+
+Status: Draft (2025-11-20)
+Owners: Telemetry Core Guild
+Scope: Context propagation middleware/adapters for HTTP, gRPC, background jobs, CLI.
+
+## Proposed propagation fields
+- `trace_id`, `span_id`, `tenant_id`, `actor`, `imposed_rule`, `correlation_id`.
+- Async resume harness for job queue workers.
+
+## Open decisions
+- Final field names and required/optional list.
+- Which carriers (headers) per transport: HTTP (`x-` headers), gRPC metadata, CLI env.
+
+## Handoff
+Use as prep artefact; update once field list and carriers are finalized.