chore: update version to 2.4.5 and enhance changelog management scripts

scripts-workflow/bump_changelog.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# bump_changelog.sh
+# - prepend ./Changelog.md to ./docs/Changelog.history.md
+# - overwrite ./Changelog.md with ./template/Changelog.md
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$ROOT_DIR"
+
+CHANGELOG="Changelog.md"
+HISTORY="docs/Changelog.history.md"
+TEMPLATE="template/Changelog.md"
+
+timestamp() { date +"%Y%m%d%H%M%S"; }
+
+echo "Repo root: $ROOT_DIR"
+
+if [ ! -f "$CHANGELOG" ]; then
+	echo "Error: $CHANGELOG not found" >&2
+	exit 2
+fi
+
+if [ ! -f "$TEMPLATE" ]; then
+	echo "Error: $TEMPLATE not found" >&2
+	exit 3
+fi
+
+BACKUP_DIR=".changelog_backups"
+mkdir -p "$BACKUP_DIR"
+
+bak_ts=$(timestamp)
+cp "$CHANGELOG" "$BACKUP_DIR/Changelog.md.bak.$bak_ts"
+echo "Backed up $CHANGELOG -> $BACKUP_DIR/Changelog.md.bak.$bak_ts"
+
+if [ -f "$HISTORY" ]; then
+	cp "$HISTORY" "$BACKUP_DIR/Changelog.history.md.bak.$bak_ts"
+	echo "Backed up $HISTORY -> $BACKUP_DIR/Changelog.history.md.bak.$bak_ts"
+fi
+
+# Prepend current Changelog.md content to top of docs/Changelog.history.md
+tmpfile=$(mktemp)
+{
+	cat "$CHANGELOG"
+	echo
+	echo "" 
+	if [ -f "$HISTORY" ]; then
+		cat "$HISTORY"
+	fi
+} > "$tmpfile"
+
+mv "$tmpfile" "$HISTORY"
+echo "Prepended $CHANGELOG -> $HISTORY"
+
+# Overwrite Changelog.md with template
+cp "$TEMPLATE" "$CHANGELOG"
+echo "Overwrote $CHANGELOG with $TEMPLATE"
+
+echo "Done. Backups saved under $BACKUP_DIR"
+
+exit 0