[panviktor]

Summary

• add phase 4.10 plan and external audit docs
• extract provider-facing context assembly into an adapter-level context engine module
• expose provider context breakdown through observability and SSE

Validation

• cargo check -q -p synapse_adapters -p synapse_observability -p synapseclaw --features channel-matrix
• cargo test -q -p synapse_observability

Notes

• targeted synapse_adapters lib test still hits existing unrelated AppState initializer failures around heartbeat_metrics