v0.3.1: automated releases + version-drift check

The "Automated releases" entry was written under v0.3.0, but that commit landed
after the v0.3.0 tag -- the CHANGELOG was claiming the release contained something
it did not. Moved to its own version rather than left as a quiet inaccuracy.

Bumps VERSION to 0.3.1 across all four scripts, which the new consistency check
now enforces.

patch/apply.sh

@@ -32,7 +32,7 @@
 # Derive PATCH_DIR from this script's location (parent of the patch/ directory).
 PATCH_DIR="$(cd "$(dirname "$0")/.." && pwd)"
 LOG="$PATCH_DIR/apply.log"
-VERSION="0.3.0"
+VERSION="0.3.1"
 
 # Rotate log at 512 KB to avoid unbounded growth on a system volume.
 # Keep two prior generations (.1 and .2) so the last three boots are always available.