WriteNfcTagTool
Writes a single NDEF record (text or URI) to the most recently scanned tag.
Operates on the tag cached in NfcTagCache, so a tag must have been scanned first (see ReadNfcTagTool). Requires NFC available and enabled, and the tag to support NDEF and be writable with enough capacity. Destructive — overwrites tag contents.
Output keys: success, type, content, bytes_written.