feat(c-miner): port miner pipeline to modular C implementation

main.c

@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "mining_loop.h"
+
+static void usage(const char *prog) {
+    fprintf(stderr, "Uso: %s [--config miner.conf] [--worker-idx N] [--extranonce2 HEX]\n", prog);
+}
+
+int main(int argc, char **argv) {
+    const char *config_path = "miner.conf";
+    int worker_idx = 0;
+    const char *ex2_override = NULL;
+    MinerConfig cfg;
+    int i;
+
+    for (i = 1; i < argc; i++) {
+        if (strcmp(argv[i], "--config") == 0 && i + 1 < argc) {
+            config_path = argv[++i];
+            continue;
+        }
+        if (strcmp(argv[i], "--worker-idx") == 0 && i + 1 < argc) {
+            worker_idx = atoi(argv[++i]);
+            continue;
+        }
+        if (strcmp(argv[i], "--extranonce2") == 0 && i + 1 < argc) {
+            ex2_override = argv[++i];
+            continue;
+        }
+
+        usage(argv[0]);
+        return 1;
+    }
+
+    if (config_load(config_path, &cfg) == 0) {
+        return 1;
+    }
+
+    if (ex2_override != NULL) {
+        snprintf(cfg.extranonce2, sizeof(cfg.extranonce2), "%s", ex2_override);
+    }
+
+    srand((unsigned int)(time(NULL) ^ getpid()));
+
+    return run_mining_loop(&cfg, worker_idx, cfg.extranonce2, -1);
+}