v2.1.11+prometis

EMM 2.1.11 with custom Prometis features:

• GLEIF/custom LEF support — pre-extracted LEF columns, custom cleanco terms, custom legal abbreviations
• Vectorized pandas aggregation — replaces per-account groupby().apply() with bulk vectorized ops
• Multi-name GT aggregation — new freq_weighted_entity method for multiple GT name variations per entity
• Dependency updates — scikit-learn >=1.4,<1.9; pandas <3.0; Python >=3.9