fix(parity): actual-removal delete-delay counts, rsync-accurate stats/progress/%C

- --delete-delay: count/track only entries actually removed; a directory
  refilled before commit (ENOTEMPTY) no longer inflates Number of deleted
  files or the --max-delete budget (unit + integration + rsync differential).
- --stats: per-type Number of files breakdown; only stored regular files
  count as transferred; transferred/literal byte totals and Total file size
  (symlink target lengths) now match rsync for whole-file transfers.
- --progress: print the leading ./ root line and include the root entry in
  the to-chk denominator (single-file output byte-identical to rsync).
- --out-format %C: use the selected transfer checksum and render every
  algorithm exactly like rsync; checksum_digest_file gains md4/sha1/none.
  Reclassify --out-format to Divergent (protocol-specific %b/delta-%c).
- Docs: RSYNC_COMPAT tally 107/25/24, HANDOFF update. No wire change.

src/shared/format.h

@@ -73,4 +73,22 @@ typedef struct {
 bool format_stats_send(int fd, const ReceiverStats* stats);
 bool format_stats_receive(int fd, ReceiverStats* stats);
 
+/* Sender-side file-list accounting for rsync's `--stats` block.  Filled while
+ * the scan/send loops walk each entry: the flist counters describe every
+ * scanned source entry (transferred or skipped), while the transferred/literal
+ * counters describe only the regular files the receiver actually stored.  The
+ * type split lets the client print rsync's `Number of files` breakdown; the
+ * receiver-only counters (matched data, deleted, created) come from
+ * STATUS_STATS. */
+typedef struct {
+  unsigned long long flist_reg;
+  unsigned long long flist_dir;
+  unsigned long long flist_link;
+  unsigned long long flist_special;
+  unsigned long long total_file_size;       /* sum of entry sizes (link target len) */
+  unsigned long long transferred_regular;   /* regular files actually stored */
+  unsigned long long transferred_file_size; /* source size of those files */
+  unsigned long long literal_data;          /* literal bytes sent for them */
+} TransferStats;
+
 #endif