feat: add setup-completion to help-table and library.md, remove duplicate entry

task.template

@@ -13,6 +13,7 @@ help-table() {
     rows+=("open-with-os||Open file or url with default application.")
     rows+=("open-url-with-delay|[url][delay]|Open url after n seconds.")
     rows+=("show-dotenv-setup||Show info about the dotenv setup.")
+    rows+=("setup-completion|[shell]|Show shell completion instructions.")
     rows+=("ensure-directory|[path]|Ensure directory path exists.")
     rows+=("create-symlink|[target][source]|Remove existing file/directory and create symlink.")
     rows+=("create-symlink-files|[target][source]|Create symlink for files in source pattern.")
@@ -33,7 +34,6 @@ help-table() {
     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+=("setup-completion|[shell]|Show shell completion instructions.")
     rows+=("log-error||Colored output for errors.")
     rows+=("log-success||Colored output for success.")
     rows+=("log-warning||Colored output for warnings.")