v0.5.3

What's Changed

• [synth] M1 正确性：日期/时间列、空值复现、小数标度、健壮性合集（#62-#65） by @c2j in #75
• [synth] M1 正确性（#62-#65）+ 审核意见修复（接续 #75） by @c2j in #77
• [synth] M2 保真：#66 ECDF 边际 + KS 自动择优、#67 留出集摘要 + synth report by @c2j in #78
• delta-diff: diverse sample selection + column change histogram (#79) by @c2j in #80
• synth: rules v1 extension (#68/#69/#70/#76) + review fixes by @c2j in #81
• test(synth): 固定 NULL unique-FK 池用例的 seed，消除 CI 随机红 by @c2j in #83
• synth M4: PII anonymization (#71) + child-cardinality modeling (#72) + PK uniqueness (#82) [reopened, supersedes #84] by @c2j in #85

Full Changelog: v0.5.2...v0.5.3