The wield model is now bdstbl.py: the OPO, the SE1-SE2 cavity, and the
VIP's pump and CLF optics, under BDSTBL/. The pump reaches M1 through SE1
and its reflection leaves through SE2. The VIP's squeezed path, the SQZT7
legs, and the IFO choice are gone, as are physics_SE, vip.py, sqzt7.py and
se.py. The finesse model drops VIP L1, and make_BDSTBL replaces make_OPO
and make_OPO_SE, with its parameters under BDSTBL in finesse_opo.yaml.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>