api: finish structured error normalization

TASKS.md

@@ -2,18 +2,18 @@
 
 ## Current
 
-### `feat/error-structure-normalization`
+### `feat/correlation-id-propagation`
 
 Status: in_progress
 
 DoD:
-- runtime and API errors expose structured context where stable fields exist
-- secret/runtime failure classes are mappable without parsing ad hoc message text
-- opaque third-party details remain only where no stable structure exists
+- admin-api, mcp-server, runtime, and adapters share a propagated correlation id
+- request-scoped logs can be joined across layers without guessing from timestamps
+- outbound adapter calls include correlation metadata where transport allows it
 
 ## Next
 
-- `feat/correlation-id-propagation`
+- `feat/runtime-rate-limiting-and-backpressure`
 
 ## Backlog