phase 1: cleanup, REPL polish, README

- fix format-string in jprint/script_print (printf(msg) -> fputs)
- fix bsexp_deinit: deinit_script guarded by sctx, not jc
- silence "config.script not found" when the optional override is absent
- remove dead code: bs/cmds/, bs/args.{c,h}, bs/utils.h, commented blocks
- REPL: welcome banner with version, readline tab-completion on
  script_commands_list, skip blank lines, clean Ctrl-D exit
- README: build, REPL usage, typical SPI flow, command table, probes,
  Xilinx STARTUPE3/CCLK caveat

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

bs/init.c

@@ -1,24 +1,4 @@
 #include <stddef.h>
-#include <stdio.h>
-
-/*
-#include "common.h"
-#include "cmds/help.h"
-#include "cmds/scan.h"
-#include "cmds/list_probes.h"
-#include "cmds/exit.h"
-#include "cmds/select_probe.h"
-
-// Table des commandes internes
-Command commands[] = {
-    {"help", cmd_help, NULL},
-    {"list_probes", cmd_list_probes, cmd_list_probes_help},
-    {"scan", cmd_scan, cmd_scan_help},
-    {"select_probe", cmd_select_probe, cmd_select_probe_help},
-    {"exit", cmd_exit, cmd_exit_help},
-    {NULL, NULL}};
-*/
-
 #include <stdio.h>
 #include <stdarg.h>
 #include <string.h>
@@ -27,42 +7,33 @@ Command commands[] = {
 #include "config/version.h"
 #include "script/env.h"
 #include "script/script.h"
-
 #include "config/config_script.h"
 
+#include "init.h"
+
 void jprint(jtag_core *jc, const char *msg)
 {
-    printf(msg);
+    fputs(msg, stdout);
 }
 
 int script_print(script_ctx *sctx, enum MSGTYPE typ, char *string, ...)
 {
     int ret = 0;
-    char msg[64] = {0};
+    const char *prefix = "";
     va_list args;
 
     switch (typ)
     {
-    case MSG_DEBUG:
-        strcpy(msg, "DEBUG   :");
-        break;
-	case MSG_INFO_1:
-        strcpy(msg, "INFO    :");
-        break;
-	case MSG_WARNING:
-        strcpy(msg, "WARNING :");
-        break;
-	case MSG_ERROR:
-        strcpy(msg, "ERROR   :");
-        break;
+    case MSG_DEBUG:   prefix = "DEBUG   : "; break;
+    case MSG_INFO_1:  prefix = "INFO    : "; break;
+    case MSG_WARNING: prefix = "WARNING : "; break;
+    case MSG_ERROR:   prefix = "ERROR   : "; break;
     case MSG_INFO_0:
-    default:
-        strcpy(msg, "");
-        break;
+    default:          prefix = "";           break;
     }
 
     va_start(args, string);
-    ret = printf(msg);
+    ret = fputs(prefix, stdout);
     ret += vprintf(string, args);
     va_end(args);
     return ret;
@@ -70,64 +41,61 @@ int script_print(script_ctx *sctx, enum MSGTYPE typ, char *string, ...)
 
 void bsexp_init(jtag_core **jc, script_ctx **sctx)
 {
-    // JTAG core initialization
     *jc = jtagcore_init();
     if (NULL == *jc)
-        goto end;
+        return;
 
-    // Environment initialization
     (*jc)->envvar = (void *)initEnv(NULL, NULL);
     if (NULL == (*jc)->envvar) {
         jtagcore_deinit(*jc);
         *jc = NULL;
-        goto end;
+        return;
     }
     jtagcore_setEnvVar(*jc, "VERSION", "v" APP_VER_STR(APP_VER));
 
-    // Scripts initialization
     *sctx = jtagcore_initScript(*jc);
     if (NULL == *sctx) {
         deinitEnv((*jc)->envvar);
         jtagcore_deinit(*jc);
         *jc = NULL;
-        goto end;
+        return;
     }
     setOutputFunc_script(*sctx, script_print);
     execute_ram_script(*sctx, config_script, config_script_len);
-    execute_file_script(*sctx, "config.script");
+    /* User override is optional — silence the engine's "not found" message. */
+    {
+        FILE *f = fopen("config.script", "r");
+        if (f) {
+            fclose(f);
+            execute_file_script(*sctx, "config.script");
+        }
+    }
 
-    /* Log printing callback */
     if (jtagcore_set_logs_callback(*jc, jprint) < 0)
     {
-        printf("Impossible to define the logs callback!\n");
+        fputs("Impossible to define the logs callback!\n", stderr);
+        return;
     }
-    else
+
+    if (jtagcore_getEnvVar(*jc, "LOG_MESSAGES_FILTER_LEVEL", NULL))
     {
-        if (jtagcore_getEnvVar(*jc, "LOG_MESSAGES_FILTER_LEVEL", NULL))
-        {
-            jtagcore_set_logs_level(*jc, jtagcore_getEnvVarValue(*jc, "LOG_MESSAGES_FILTER_LEVEL"));
-        }
-        if (jtagcore_getEnvVar(*jc, "LOG_MESSAGES_FILE_OUTPUT", NULL))
-        {
-            jtagcore_set_logs_file(*jc, jtagcore_getEnvVar(*jc, "LOG_MESSAGES_FILE_OUTPUT", NULL));
-        }
+        jtagcore_set_logs_level(*jc, jtagcore_getEnvVarValue(*jc, "LOG_MESSAGES_FILTER_LEVEL"));
+    }
+    if (jtagcore_getEnvVar(*jc, "LOG_MESSAGES_FILE_OUTPUT", NULL))
+    {
+        jtagcore_set_logs_file(*jc, jtagcore_getEnvVar(*jc, "LOG_MESSAGES_FILE_OUTPUT", NULL));
     }
-end:
-    return;
 }
 
 void bsexp_deinit(jtag_core *jc, script_ctx *sctx)
 {
-    envvar_entry *env = NULL;
-
-    if (NULL != jc)
+    if (NULL != sctx)
     {
         deinit_script(sctx);
     }
     if (NULL != jc)
     {
-        env = jc->envvar;
-        deinitEnv(env);
+        deinitEnv((envvar_entry *)jc->envvar);
         jtagcore_deinit(jc);
     }
 }