feat(output): rsync 3.4.1 selection and output parity (#291, #292)

#291:
- Compile --exclude/--include/--exclude-from/--include-from into the SAME
  ordered rule list as --filter/-f (first match wins), so the common
  `--include='*.txt' --exclude='*'` idiom and include-alone semantics match
  rsync. The legacy per-kind scanner arrays are no longer applied.
- -x/--one-file-system emits the cross-device mount-point directory entry
  (empty) instead of dropping it, in both the sequential and parallel scanners.
- Stop passing the legacy arrays to the scanner; document -f is --filter.

#292:
- New src/shared/format.c/.h: rsync "big_num" (comma-grouped integers) and
  decimal -h human sizes, %M/%t timestamp, and the STATUS_DEST_INFO codec.
- Receiver answers each STATUS_CHECK with a pre-transfer destination snapshot
  (new report_dest_info wire field + STATUS_DEST_INFO, PROTOCOL_VERSION
  2.23.0) so the sender can render true itemize columns.
- Itemize now emits rsync-correct update/type chars and c/s/t/p/o/g columns
  for files, dirs, symlinks and hard links, comparing size/time/perms/owner/
  group against the reported destination.
- --out-format gains %i %n %f %l %b %M %t %o %p %B %U %G %L; %f is the
  relative display path, %M the YYYY/MM/DD-HH:MM:SS form, %b the literal
  bytes sent.
- --list-only prints transfer-relative names, directory entries and ls-style
  grouped sizes.
- --stats prints rsync's multi-line block on stdout; -h uses decimal units.

Tests: unit tests for the filter ordering, format primitives, itemize
columns; integration + differential tests against real rsync 3.4.1 for
itemize/out-format/list-only/selection and -x. Golden wire len/hash and
protocol version strings updated for 2.23.0.

tests/test_format.c

@@ -0,0 +1,94 @@
+#include "test_format.h"
+#include "format.h"
+#include "test_utils.h"
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <time.h>
+#include <unistd.h>
+
+static void expect_big_num(unsigned long long value, bool human, const char* expected) {
+  char buffer[64];
+  EXPECT_TRUE(format_big_num(value, human, buffer, sizeof(buffer)));
+  EXPECT_EQ_STR(buffer, expected);
+}
+
+static void test_human_size_decimal() {
+  /* Values below 1000 print verbatim; larger values use the largest unit that
+   * keeps the value below 1000 and exactly two decimals (rsync human_num). */
+  expect_big_num(0, true, "0");
+  expect_big_num(999, true, "999");
+  expect_big_num(1000, true, "1.00K");
+  expect_big_num(1500, true, "1.50K");
+  expect_big_num(9999, true, "10.00K");
+  expect_big_num(999999, true, "1000.00K");
+  expect_big_num(1000000, true, "1.00M");
+  expect_big_num(1500000, true, "1.50M");
+}
+
+static void test_big_num_grouping() {
+  /* Non-human numbers are comma-grouped every three digits (rsync big_num). */
+  expect_big_num(0, false, "0");
+  expect_big_num(1, false, "1");
+  expect_big_num(999, false, "999");
+  expect_big_num(1000, false, "1,000");
+  expect_big_num(4096, false, "4,096");
+  expect_big_num(1234567, false, "1,234,567");
+  expect_big_num(1000000000ULL, false, "1,000,000,000");
+}
+
+static void test_datetime_format() {
+  char buffer[32];
+  time_t when = 1700000000;
+  EXPECT_TRUE(format_rsync_datetime(when, true, buffer, sizeof(buffer)));
+  /* %M shape: YYYY/MM/DD-HH:MM:SS */
+  EXPECT_EQ_INT(strlen(buffer), 19);
+  EXPECT_EQ_INT(buffer[4], '/');
+  EXPECT_EQ_INT(buffer[7], '/');
+  EXPECT_EQ_INT(buffer[10], '-');
+  EXPECT_EQ_INT(buffer[13], ':');
+  EXPECT_EQ_INT(buffer[16], ':');
+
+  char space_form[32];
+  EXPECT_TRUE(format_rsync_datetime(when, false, space_form, sizeof(space_form)));
+  EXPECT_EQ_INT(space_form[10], ' ');
+}
+
+static void test_dest_state_roundtrip() {
+  /* The wire codec is exercised over a socketpair so the real send/receive
+   * primitives run. */
+  int fds[2];
+  if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) != 0)
+    return;
+  OutputDestState out;
+  memset(&out, 0, sizeof(out));
+  out.known = true;
+  out.existed = true;
+  out.size = 123456789ULL;
+  out.mtime_sec = 1700000000;
+  out.mtime_nsec = 123456789;
+  out.mode = 0100644;
+  out.uid = 1000;
+  out.gid = 1000;
+  OutputDestState in;
+  memset(&in, 0, sizeof(in));
+  EXPECT_TRUE(format_dest_state_send(fds[0], &out));
+  EXPECT_TRUE(format_dest_state_receive(fds[1], &in));
+  EXPECT_TRUE(in.known);
+  EXPECT_TRUE(in.existed);
+  EXPECT_TRUE(in.size == out.size);
+  EXPECT_TRUE(in.mtime_sec == out.mtime_sec);
+  EXPECT_TRUE(in.mtime_nsec == out.mtime_nsec);
+  EXPECT_TRUE(in.mode == out.mode);
+  EXPECT_TRUE(in.uid == out.uid);
+  EXPECT_TRUE(in.gid == out.gid);
+  close(fds[0]);
+  close(fds[1]);
+}
+
+void test_format(void) {
+  test_human_size_decimal();
+  test_big_num_grouping();
+  test_datetime_format();
+  test_dest_state_roundtrip();
+}