feat: check for squash commits

ref: N25B-241

.githooks/check-commit-msg.sh

@@ -53,6 +53,14 @@ if grep -qE "$CHERRY_PICK_PATTERN" "$COMMIT_MSG_FILE"; then
   exit 0
 fi
 
+# Check for Squash
+# Example: "Squash commits ..."
+SQUASH_PATTERN="^Squash .+"
+if [[ "$HEADER" =~ $SQUASH_PATTERN ]]; then
+  echo -e "${GREEN}Squash commit detected by message content. Skipping validation.${NC}"
+  exit 0
+fi
+
 # --- Validation Functions ---
 
 # Function to print an error message and exit