refactor: standardize verify() parameter name to domain_checks across all DSLs

[rororowyourboat]

Problem

The verify() function uses a different parameter name for domain-specific checks in every package:

Package	Parameter	File
stockflow	sf_checks	stockflow/verification/engine.py:19
gds-control	cs_checks	gds_control/verification/engine.py:19
gds-software	domain_checks	gds_software/verification/engine.py:17
gds-business	domain_checks	gds_business/verification/engine.py:17
gds-games (ogs)	checks	ogs/verification/engine.py:59

Proposal

Standardize all to domain_checks (already used by the two newest packages). This is a breaking change for stockflow, control, and games.

Migration

Keyword-only argument rename. Could keep old names as deprecated aliases temporarily.