registry

host module (Windows)

Windows registry — hive-prefixed keys; registered everywhere, runtime-errors off Windows.

use registry — Windows registry. Registered on every platform so playbooks compile and validate identically everywhere; off Windows its calls return runtime errors. Guard with a condition (os.family == "windows") or sys::family(). Keys are hive-prefixed paths: HKLM\Software\Vendor\App. Constants: registry::HKLM HKCU HKCR HKU HKCC.

function	signature	notes
read	(key, name) -> Result[Option[Value], string]	None when absent; typed values (SZ, DWORD, QWORD, EXPANDSZ, MULTISZ)
write	(key, name, value: Value, kind: string) -> Result[unit, string]	kind: sz | dword | qword | expand_sz | multi_sz
delete_value	(key, name) -> Result[unit, string]
create_key	(key) -> Result[unit, string]	creates parents
delete_key	(key) -> Result[unit, string]	deletes the subtree
key_exists	(key) -> Result[bool, string]