org.gamecult.cultlib CHANGELOG: flush over damage refuses; stamps judged before the body (Unreleased, major)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

unity/org.gamecult.cultlib/CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to this package are documented in this file.
 
+## [Unreleased]
+
+### Breaking (major)
+
+- A single-file store flush refuses a file it cannot read (empty, truncated, an unreadable stamp or body) with `CultStoreUnreadableException` and leaves the file as it is. A flush used to replace such a file. A write set cannot merge with a disk it cannot read, so the file is repaired or removed by its owner before the store writes again.
+- A single-file store reads v1, v2 and v3 stamps and refuses v4 and later by name; a directory store reads v4 and v5 and refuses v6 and later by name. Each judges the stamp before the body, so an unreadable body never makes a newer store look like damage.
+
 ## [2.0.0] - 2026-10-22
 
 ### Breaking