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_format_table.hpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+namespace wowee {
+namespace editor {
+namespace cli {
+
+// Shared table of every novel open format the editor
+// recognizes — extracted so --info-magic and --summary-dir
+// can both look up files by their 4-byte magic without
+// drifting. Adding a new format requires appending one row
+// in cli_format_table.cpp.
+struct FormatMagicEntry {
+    char magic[4];           // 4-char binary magic
+    const char* extension;   // file suffix (with dot)
+    const char* category;    // grouping label
+    const char* infoFlag;    // --info-* flag, nullptr if none
+    const char* description;
+};
+
+// Returns a pointer into the static table on match, nullptr
+// otherwise. The 4-byte magic argument does NOT need to be
+// null-terminated — only the first 4 bytes are inspected.
+const FormatMagicEntry* findFormatByMagic(const char magic[4]);
+
+// Iterate the table — used by --summary-dir to pre-allocate
+// per-format counters keyed by index, and by tooling that
+// wants to enumerate the full set.
+const FormatMagicEntry* formatTableBegin();
+const FormatMagicEntry* formatTableEnd();
+size_t formatTableSize();
+
+} // namespace cli
+} // namespace editor
+} // namespace wowee