comark/cast/invalid-event · Write every line after the header as an event

After the header, every line of a cast is a JSON event: the time, a code such as "o" for output, and its text. A line that isn't one, such as a stray note or a trailing comma, stops the replay, and the cast renders nothing. The message gives the line's number. A comment starts with #.

Incorrect

::cast
```json
{"version": 2, "width": 40, "height": 3}
[0.1, "o", "$ pnpm deploy\r\n"]
The ducks are fed
```
::

lint-comark example.mdexample.md:1:1 comark/cast/invalid-event::cast 1: line 3 isn't an event like [0.5, "o", "text"].Fix it or remove it.✖ 1 problem

Correct

::cast
```json
{"version": 2, "width": 40, "height": 3}
[0.1, "o", "$ pnpm deploy\r\n"]
[0.4, "o", "The ducks are fed\r\n"]
```
::

lint-comark example.md✔ No problems