GST canonical declaration deposit for the CMS dimuon and electroweak audit

Canonical GST declaration deposit for the CMS dimuon/electroweak sector. The deposit fixes G_s, Z_s, Θ_s, the sector-calibrated reporting dimension N_s=20, and the dimension-robustness grid. It references CERN Open Data record 545 as the external source sector. This deposit contains declaration and audit-specification artifacts only, not CMS raw detector data.