Clean up roadmap and fallback profile guidance

docs/consumers/pkg-promptkit.md

@@ -53,14 +53,18 @@ var applicationProfiles embed.FS
 
 engine, err := promptkit.NewEngine(promptkit.Config{
 	PromptDir:  "prompts",
-	ProfileDir: "profiles",
+	ProfileDir: operatorProfileDir,
 },
 	promptkit.WithFallbackProfileFS(applicationProfiles, "profiles"),
 )
 ```
 
 Keep application-owned profile IDs and definitions in the embedded source.
-Use the ordinary configured profile source for operator overrides. The
+Use the ordinary configured profile source for operator overrides. Leave
+`operatorProfileDir` empty when the operator did not configure an override
+directory; a non-empty path names an authoritative higher-precedence source,
+so an unavailable or unreadable directory is an error rather than a reason to
+fall back. The
 [framework format reference](../formats.md#source-and-profile-precedence)
 owns the exact profile format and lookup order; the
 [`WithFallbackProfileFS` GoDoc](../../engine.go) owns its option contract and