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

rpc.h

@@ -0,0 +1,23 @@
+#ifndef RPC_H
+#define RPC_H
+
+#include <stddef.h>
+
+#include "config.h"
+#include "types.h"
+
+typedef struct {
+    const MinerConfig *cfg;
+} RpcClient;
+
+void rpc_init(RpcClient *client, const MinerConfig *cfg);
+
+int rpc_test_connection(RpcClient *client, char **chain_out);
+int rpc_get_best_block_hash(RpcClient *client, char **hash_out);
+int rpc_get_block_template(RpcClient *client, BlockTemplate *tpl);
+int rpc_get_address_script_pubkey(RpcClient *client, const char *wallet_address, char **script_out);
+int rpc_get_raw_transaction(RpcClient *client, const char *txid, char **raw_tx_out);
+int rpc_ensure_witness_data(RpcClient *client, BlockTemplate *tpl);
+int rpc_submit_block(RpcClient *client, const char *serialized_block);
+
+#endif