Document identified resource formats and interpretation

docs/internal/observation.md

@@ -25,8 +25,7 @@ other content. Events are values with no mutable containers. Callback panics
 propagate to the caller.
 Resolved prompt and profile IDs are the exact runtime identities selected for
 the invocation, including namespace qualification when supplied by an engine
-view. A prompt's optional version label is descriptive metadata, not a
-selection key.
+view.
 Per-operation callbacks are ordered and synchronous; different operations may
 invoke the same callback concurrently. The recorder marks each measured phase's
 end before delivery, so callback work does not inflate provider duration.