R-2: gitignore chaindata/snapshot/tarball patterns

.gitignore

@@ -1,2 +1,13 @@
 .env
 peer-backups/
+
+# R-2 (fleet-audit): keep chaindata/snapshots/tarballs out of git status. Some land
+# in-tree via per-host _DATA overrides or snapshot staging; evict to /slowdisk at the
+# next maintenance window — see fleet-audit-2026-07-07.md §R-2.
+*.tar
+*.tar.*
+*.lz4
+*.zst
+snapshots/
+*.bak
+*.swp