fix(run_tb): allow digits in TCL variable names (e.g. SHA3_DIR)

Grep pattern [A-Z_]+ rejected variable names containing digits
like SHA3_DIR, SHA3C_DIR, NTT_DIR, etc. Changed to [A-Z0-9_]+.

run_tb.sh

@@ -64,7 +64,7 @@ execute_tcl() {
 
     # Convert TCL 'set VAR value' to bash 'VAR=value'
     {
-        grep -E '^set [A-Z_]+ ' "$tcl_file" | while read -r _ var value; do
+        grep -E '^set [A-Z0-9_]+ ' "$tcl_file" | while read -r _ var value; do
             echo "${var}=${value}"
         done