fix: Clean up remaining automatic task file generation calls (#1025)

* Don't generate task files unless requested

* add changeset

* switch to optional generate flag instead of skip-generate based on new default

* switch generate default to false and update flags and docs

* revert DO/DON'T section

* use simpler non ANSI-C quoting

scripts/modules/task-manager/add-subtask.js

@@ -21,7 +21,7 @@ async function addSubtask(
 	parentId,
 	existingTaskId = null,
 	newSubtaskData = null,
-	generateFiles = true,
+	generateFiles = false,
 	context = {}
 ) {
 	const { projectRoot, tag } = context;