Initial commit: stalwart-migrator design and scaffolding

In-place upgrade tool for Stalwart Mail Server (0.15.5 -> latest) with checkpointed rollback and post-migration validation. Design stage; see ARCHITECTURE.md.
2026-08-22 18:17:17 -07:00
commit 719a945d64
71 changed files with 6677 additions and 0 deletions
@@ -0,0 +1,3 @@
+// Package checkpoint implements run-id and state.json persistence, resume logic, and rollback-window tracking.
+// See ARCHITECTURE.md §5 for the design.
+package checkpoint