chore(repo): keep only current main snapshot

History squashed to one root commit to permanently drop old branch history and objects.

components/domain/README.md

@@ -0,0 +1,9 @@
+# Domain Layer
+
+Purpose: business capabilities with single responsibility per domain service.
+
+Rules:
+- Expose stable domain APIs in `include/`.
+- Keep implementation details in `internal/` and `src/`.
+- No direct cross-domain internal state access.
+- Cross-domain interactions must use events or Port interfaces.