Add configurable transient retries for CLI execution

docs/internal/adapters.md

@@ -33,6 +33,10 @@ described by its tagged
 and profile selection, optional file inputs, variables, and presence-aware
 execution overrides. Omitted framework settings remain zero values so Promptkit
 resolves its own defaults and definition-required inputs.
+The application retry setting enters shared engine construction, while a
+run/render flag enters only the mapped request. The server uses the same engine
+setting and retains one backend admission state. Render prepares without
+generation.
 
 `inspect prompt` maps the selected ID and optional version to
 `promptkit.Engine.InspectPrompt`, then formats Scriptorium-owned inspection