control2 (final layout) has no BOM/XY/Gerber export

[ramereth]

control2.* is the final layout in this repository — DB9 removed, R17 added —
but it was never exported for assembly:

• no control2_bom.csv
• no control2_xy.csv
• 20191222.zip and 20191223.zip predate it

So the only assembly files present describe older revisions. Anyone ordering
from this repo today would either fabricate rev 1/rev 2, or hand-build an export
under time pressure.

Action: open control2.pcb in pcb-rnd, export BOM, centroid and Gerbers,
and commit them alongside. Then add control2.pcb to the SETS list in
tools/check_bom.py so the new export is checked like the others.

Flagged automatically by tools/check_bom.py, which currently emits:

WARN  control2.pcb has no BOM/XY export. Anything sent to a fab must be
      re-exported from the newest layout.