feat(parity): wire-stats protocol 2.25.0 + out-format %b/%c/%C

Bump PROTOCOL_VERSION to 2.25.0 and append a report_stats bool to the
config frame, add a STATUS_STATS status, and add process-wide wire byte
counters (protocol_bytes_written/read) for the client.

Render the rsync 3.4.1 --out-format %b (wire bytes sent) and %c (wire
bytes read back) tokens from per-file counter deltas, and %C (whole-file
xxh128 checksum, seed 0) via a new streaming checksum_digest_file().

tests/integration/test_fault_injection.py

@@ -36,7 +36,7 @@ from common import (  # noqa: E402
     verify_transfer,
 )
 
-PROTOCOL_VERSION = b"2.23.0"
+PROTOCOL_VERSION = b"2.25.0"
 STATUS_MANIFEST = 5
 STATUS_OK = 0
 

tests/integration/test_preflight.py

@@ -94,14 +94,14 @@ def _seed_protocol_source(source):
 class TestProtocol:
     @pytest.mark.ci
     def test_protocol_current_version_accepted(self, shared_server):
-        """--protocol=2.23.0 (the current PROTOCOL_VERSION) is accepted and the
+        """--protocol=2.25.0 (the current PROTOCOL_VERSION) is accepted and the
         transfer completes normally."""
         source = os.path.join(TEST_DATA_DIR, "proto_ok_src")
         dest = os.path.join(TEST_DATA_DIR, "proto_ok_dst")
         shutil.rmtree(dest, ignore_errors=True)
         os.makedirs(dest)
         _seed_protocol_source(source)
-        result, _ = run_client(source, dest, flags=["--protocol=2.23.0"],
+        result, _ = run_client(source, dest, flags=["--protocol=2.25.0"],
                                port=shared_server.port)
         assert result.returncode == 0, \
             f"--protocol current run failed: {(result.stderr or result.stdout)[:400]}"

tests/test_client_cli.c

@@ -317,7 +317,7 @@ static void test_parse_args_protocol_accept_current() {
   Config* cfg = valid_client_config();
   EXPECT_NOT_NULL(cfg);
   char* argv_equals[] = {"fastsync",   "--source-dir", "/src",
-                         "--dest-dir", "/dst",         "--protocol=2.23.0"};
+                         "--dest-dir", "/dst",         "--protocol=2.25.0"};
   int positional_args[2];
   int positional_count = 0;
   EXPECT_EQ_INT(parse_args(cfg, 6, argv_equals, positional_args, &positional_count), 0);
@@ -327,7 +327,7 @@ static void test_parse_args_protocol_accept_current() {
   cfg = valid_client_config();
   EXPECT_NOT_NULL(cfg);
   char* argv_space[] = {"fastsync", "--source-dir", "/src",  "--dest-dir",
-                        "/dst",     "--protocol",   "2.23.0"};
+                        "/dst",     "--protocol",   "2.25.0"};
   positional_count = 0;
   EXPECT_EQ_INT(parse_args(cfg, 7, argv_space, positional_args, &positional_count), 0);
   EXPECT_EQ_STR(cfg->version, PROTOCOL_VERSION);

tests/test_config.c

@@ -2763,14 +2763,13 @@ static void golden_config_populate(Config* c) {
   c->copy_as_gid = 222;
 }
 
-/* The pinned golden frame (protocol 2.23.0).  The values below are the only
+/* The pinned golden frame (protocol 2.25.0).  The values below are the only
  * thing that ties the generated table to the historical wire format; update
- * them ONLY with a PROTOCOL_VERSION bump and a documented reason.  The 2.23.0
- * rsync-parity wave changes the config-frame layout (map-entry range + TO name,
- * one report_dest_info bool, and other wire changes landing in this version);
- * the byte-exact values are recomputed for the merged layout. */
-#define GOLDEN_WIRE_LEN 697
-#define GOLDEN_WIRE_HASH 7835017034643051109ULL
+ * them ONLY with a PROTOCOL_VERSION bump and a documented reason.  The 2.25.0
+ * wire-stats wave appends one report_stats bool to the config frame; the
+ * byte-exact values are recomputed for the merged layout. */
+#define GOLDEN_WIRE_LEN 701
+#define GOLDEN_WIRE_HASH 16170466870400670271ULL
 
 static unsigned long long fnv1a_64(const unsigned char* buf, size_t len) {
   unsigned long long h = 1469598103934665603ULL;

tests/test_fuzz_smoke.c

@@ -18,9 +18,10 @@
 
 /* P8 config-frame tail: super_mode (4) + copy-as presence (4) + uid (4) + gid (4). */
 #define P8_TAIL_BYTES 16
-/* Protocol 2.23.0 appends one trailing bool (report_dest_info) AFTER the P8
- * tail, so the P8 fields sit this many bytes before the end of the frame. */
-#define OUTPUT_TAIL_BYTES 4
+/* Protocol 2.25.0 appends two trailing bools (report_dest_info, report_stats)
+ * AFTER the P8 tail, so the P8 fields sit this many bytes before the end of the
+ * frame. */
+#define OUTPUT_TAIL_BYTES 8
 
 /* Smoke test for chunk_deserialize fuzz target */
 static void test_fuzz_chunk_deserialize() {