Function append_window_audit_log_entry 

pub(crate) fn append_window_audit_log_entry(entry: &Value)

Shared append-only NDJSON writer for both window-tool audit trails above — best-effort (a logging failure must never break the tool itself), inside capture_window_dir() itself since prune_old_captures’s PNG-only extension filter already leaves a .log file in that same directory untouched, so this doesn’t need (or want) its own directory.