v2.7.0

What's Changed

• Fix CS event study SEs (missing WIF) + simultaneous confidence bands by @igerber in #189
• Update Codex AI review model to gpt-5.4 by @igerber in #193
• Fix overly strict AI PR review prompt causing excessive review cycles by @igerber in #196
• Document exact AI reviewer deviation label formats by @igerber in #197
• Add EfficientDiD estimator (Chen, Sant'Anna & Xie 2025) by @igerber in #192
• Add (1-W) weight masking to TROP global method by @igerber in #195
• Document estimator aliases for user discoverability by @igerber in #198
• Optimize CallawaySantAnna covariate path (5-19x speedup) by @igerber in #194
• Add EfficientDiD documentation and tutorial notebook by @igerber in #199
• Release v2.7.0 by @igerber in #200

Full Changelog: v2.6.1...v2.7.0