feat(pipeline): add WBNK (Wowee Bag / Bank Slot) catalog

61st open format — replaces ItemBag.dbc plus the bank-storage
and special-purpose container tables. Defines every slot the
player has access to: equipped bags, bank bags, keyring, soul
shard bag, quiver, reagent bag, hunter pet stable.

8 bag kinds (Inventory / Bank / Keyring / Quiver / SoulShard /
Stable / Reagent / Wallet) cover the canonical container
surface. Each entry has a fixed capacity (or 0 = variable,
size set by equipped bag), a display order in the inventory
UI, an unlock state with optional gold cost (bank bags ramp
through 10s / 1g / 10g / 25g / 50g / 100g matching canonical
WoW prices), and an accepts-bag-subclass mask gating which
container kinds may be equipped (generic / herb / enchanting
/ engineer / gem / mining / leather / inscription / quiver /
ammo pouch).

Cross-references with prior formats — fixedBagItemId points
at WIT.itemId for the bag item that always occupies a fixed
slot (0 = player-equipable variable slot).

CLI: --gen-bnk (5 inventory slots — 16-slot fixed main
backpack + 4 player-equippable bag slots accepting generic
containers + herb + enchanting bags), --gen-bnk-bank (8 bank
bag slots with the canonical WoW unlock cost ramp),
--gen-bnk-special (4 special-purpose: 32-slot Keyring fixed,
warlock SoulShardBag, hunter ArrowQuiver, hunter
HuntersStable for 5 pets), --info-wbnk, --validate-wbnk with
--json variants. Validator catches id+name required, kind
0..7, locked-with-zero-cost (slot can never be unlocked),
fixed-slot-with-non-zero-mask (equippable bag would be
ignored), variable slot with empty mask (no bag can fit),
and ambiguous (bagKind, displayOrder) tuples (UI sort would
flicker).

Format graph: 60 → 61 binary formats. CLI flag count: 833
→ 840.

tools/editor/cli_format_table.cpp

@@ -63,6 +63,7 @@ constexpr FormatMagicEntry kFormats[] = {
     {{'W','M','A','C'}, ".wmac",  "ui",        "--info-wmac",      "Macro / slash command catalog"},
     {{'W','C','H','F'}, ".wchf",  "chars",     "--info-wchf",      "Character hair / face customization catalog"},
     {{'W','P','V','P'}, ".wpvp",  "pvp",       "--info-wpvp",      "PvP honor rank + arena tier catalog"},
+    {{'W','B','N','K'}, ".wbnk",  "items",     "--info-wbnk",      "Bag / bank slot catalog"},
     {{'W','F','A','C'}, ".wfac",  "factions",  nullptr,            "Faction catalog"},
     {{'W','L','C','K'}, ".wlck",  "locks",     nullptr,            "Lock catalog"},
     {{'W','S','K','L'}, ".wskl",  "skills",    nullptr,            "Skill catalog"},