Forward cache_ttl_seconds on manager-target fixture calls

PR #172 review: _run_call's manager-target fetch/get dropped
call.cache_ttl_seconds, so target: manager fixtures couldn't exercise
the manager's threading (033/034 use direct-backend targets, so they
were unaffected). Forward the control on both, matching the
direct-backend path.

Author: chris-colinsky

tests/conformance/test_prompt_management.py

@@ -347,7 +347,10 @@ async def _run_call(
             assert manager is not None
             if operation == "fetch":
                 assert call.name is not None
-                return await manager.fetch(call.name, call.label), None
+                return (
+                    await manager.fetch(call.name, call.label, cache_ttl_seconds=call.cache_ttl_seconds),
+                    None,
+                )
             if operation == "render":
                 # Either inline fetched_prompt or a ref to a capture.
                 if call.fetched_prompt_ref is not None:
@@ -382,6 +385,7 @@ async def _run_call(
                         call.label,
                         call.variables or {},
                         placeholders=placeholders,
+                        cache_ttl_seconds=call.cache_ttl_seconds,
                     ),
                     None,
                 )