v3.5.3

What's Changed

• fix: clamp negative vcov diagonal in LinearRegression SE (no NaN SE for degenerate coefs) by @igerber in #542
• docs: Gardner (2022) paper review — TwoStageDiD (PR-A) by @igerber in #539
• Add synthetic control tutorial + generate_synthetic_control_data generator by @igerber in #540
• fix: route TripleDifference power to panel DGP when n_periods > 2 by @igerber in #544
• TwoStageDiD methodology validation (PR-B): did2s parity + exact GMM variance by @igerber in #545
• Fix wild cluster bootstrap p-value / CI inconsistency (WCR + test inversion, #543) by @igerber in #546
• Release v3.5.3 by @igerber in #547

Full Changelog: v3.5.2...v3.5.3