Read-only normalized command event (DD-005 §4.3, amendment 1): observers see each lexed command BEFORE dispatch and cannot alter parsing.
Normalized lowercase word+number, e.g. 'm486'.
The raw line, for vendor syntaxes the lexer's params don't capture.
Segment count at event time — maps events to segment ranges.
Read-only normalized command event (DD-005 §4.3, amendment 1): observers see each lexed command BEFORE dispatch and cannot alter parsing.