Prototype recorder output

mtgo-bo3.mtgr is a best-of-three Modern match recorded from MTGO by the prototype recorder, before this specification existed. The prototype tagged its files [Mtgr "0.2.0"], but that was never a published version of the format.

It is kept unchanged because the decision records use it as their reference case: it shows what a recorder without a specification writes, and what a reader cannot work out from it. It is not a valid .mtgr file. Game 1 is converted to the specified format in ../mycospawn-turn-5.md.