parity: --info=mount/stats, --stats dir breakdown, --debug categories

--info=mount now prints rsync's mount-point skip line (matching rsync
3.4.1, which emits it for repeated -xx and drops the mount-point dir);
--info=stats enables the same block as --stats; -x is repeatable.
--stats counts traversed directories for the Number of files breakdown
even when no directory metadata is captured (-r without -t/-p).
--debug enables real output for flist/del/hash/deltasum/recv/filter/send
at their natural FastSync events (synthetic categories stay inert).

--stats and --debug rows keep their documented residual status.

src/shared/log.h

@@ -13,7 +13,19 @@ typedef enum {
   LOG_DEBUG_PROTO = 1u << 1,
   LOG_DEBUG_PACK = 1u << 2,
   LOG_DEBUG_UTIL = 1u << 3,
-  LOG_DEBUG_ALL = (1u << 4) - 1,
+  /* rsync --debug categories that now map to a natural FastSync event:
+   * flist (file-list scan progress), del (deletions), hash/deltasum
+   * (whole-file hashing and delta-sum generation), recv (receiver
+   * responses/signatures), filter (selection/exclusion decisions) and send
+   * (files handed to the sender).  Only emitted when the category is
+   * explicitly enabled; a normal run stays silent. */
+  LOG_DEBUG_FLIST = 1u << 4,
+  LOG_DEBUG_DEL = 1u << 5,
+  LOG_DEBUG_HASH = 1u << 6,
+  LOG_DEBUG_RECV = 1u << 7,
+  LOG_DEBUG_FILTER = 1u << 8,
+  LOG_DEBUG_SEND = 1u << 9,
+  LOG_DEBUG_ALL = (1u << 10) - 1,
 } LogDebugFlag;
 
 typedef enum {
@@ -38,9 +50,13 @@ typedef enum {
      the info_level bitset (there is no separate Config field) and is never set
      by --info=all (which selects level 1). */
   LOG_INFO_NAME_UPTODATE = 1u << 10,
+  /* --info=mount: print rsync's `[sender] skipping mount-point dir NAME` when
+   * -xx/--one-file-system drops a mount-point directory (FastSync's client is
+   * the sender). */
+  LOG_INFO_MOUNT = 1u << 11,
   LOG_INFO_ALL = LOG_INFO_COPY | LOG_INFO_MISC | LOG_INFO_SKIP | LOG_INFO_STATS | LOG_INFO_DEL |
                  LOG_INFO_REMOVE | LOG_INFO_NAME | LOG_INFO_FLIST | LOG_INFO_NONREG |
-                 LOG_INFO_PROGRESS,
+                 LOG_INFO_PROGRESS | LOG_INFO_MOUNT,
 } LogInfoFlag;
 
 void log_message(LogLevel log_level, const char* message, ...);