feat(create-prompt, list-prompts): add optional path parameter for custom prompts directory

task.template

@@ -38,7 +38,7 @@ help-table() {
     rows+=("update-with-llm|[glob][prompt]|Feed files matching glob to LLM and apply changes.")
     rows+=("update-changelog-with-llm||Update CHANGELOG.md with changes from staged git diff using LLM.")
     rows+=("create-prompt||Create a new prompt file from template.")
-    rows+=("list-prompts||List all prompt files.")
+    rows+=("list-prompts|[path]|List all prompt files.")
     rows+=("===Logging===| | ")
     rows+=("log-error||Colored output for errors.")
     rows+=("log-success||Colored output for success.")