feat(editor): add --summary-dir bulk content inventory

Recursively walks a directory, identifies every file by 4-byte
magic, and reports per-format file count, total entries, and
bytes. Useful for content audits ("how many cinematics did
this asset bundle ship?") and for tracking migration progress
("what fraction of zones still lack a holiday catalog?").

Also extracts the format-magic table out of cli_info_magic.cpp
into a shared cli_format_table.{hpp,cpp} so --info-magic and
--summary-dir reuse the same source of truth — adding a new
format now updates one row in one file instead of two. Both
flags use the standard catalog header (magic + version + name
+ entryCount) for catalog formats; asset/world formats are
counted but report 0 entries since their headers differ.

Supports --json variant for tooling integration.

tools/editor/cli_help.cpp

@@ -1351,6 +1351,8 @@ void printUsage(const char* argv0) {
     std::printf("                         Print the catalog of all novel open formats (magic / extension / category / replaces / description)\n");
     std::printf("  --info-magic <path> [--json]\n");
     std::printf("                         Auto-detect any .w* file by 4-byte magic; report format / version / catalog name / entry count + suggest --info-* flag\n");
+    std::printf("  --summary-dir <dir> [--json]\n");
+    std::printf("                         Recursively walk a directory; report per-format file count, total entries, and bytes for every Wowee open format found\n");
     std::printf("  --gen-animations <wani-base> [name]\n");
     std::printf("                         Emit .wani starter: 5 essential animations (Stand / Walk / Run / Death / AttackUnarmed) with fallback chains\n");
     std::printf("  --gen-animations-combat <wani-base> [name]\n");