docs: map inventory weapon sets and combat-art slots; function names

Groundwork for 7 weapon sets / 7 combat-art slots (docs/skill-slots.md).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

docs/skill-slots.md

@@ -0,0 +1,91 @@
+# 7 weapon sets and 7 combat-art slots (planned)
+
+Goal (user request 2026-10-14): 7 weapon sets and 7 combat-art slots instead
+of 5 each; skills on 1-7, weapon sets on F1-F7; old saves keep loading
+(migration on read). Status: mapping, nothing changed yet.
+
+## Where the slots live
+
+### `cInventoryEntry` (one per player, no vtable)
+
+All 32 inventories are one block from `cInventoryManager::Instance`
+(`0x5deb80`, 32 x 0x1180 + 8 bytes at `*0xad23c8`); `GetInventory`
+(`0x5dec50`) hardcodes the stride 0x1180. An inventory's index is therefore
+`(inventory - block) / 0x1180`.
+
+| Offset | Size | Content |
+|---|---|---|
+| +0x18 | 0x100 x 0xc | item grid |
+| +0xc18 | 5 x 0x18 | weapon sets: 2 hands x (item id, 2 dwords) |
+| +0xc90 | 5 x 2 x 0x14 | art slots: 2 variants (bit 2 of +0x1162, maybe mounted) x {u16 type 2/3/4, u16, id, 3 dwords} |
+| +0xd58 | 2 x u16 | selected slot: [0] weapon set, [1] art slot |
+| +0xd5c | 0x400 | (next field, unrelated) |
+| +0x115c / +0x115e | u16 | grid width 0x14 / height 8 |
+| +0x1160 | u16 | player index |
+| +0x1162 | u16 | flags |
+
+The three slot arrays are packed together, so there is no room for slots
+6 and 7 in the object.
+
+Methods (names in `tools/names.txt`): `GetWeaponSetItem` `0x5d86c0`,
+`SetWeaponSetItem` `0x5d86f0`, `SetWeaponSet` `0x5d8930`,
+`TakeWeaponSetItem` `0x5d8be0`, `GetWeaponSetItemPos` `0x5d8d00`,
+`GetArtSlotType` `0x5d93e0`, `GetArtSlotRef` `0x5d9420`, `SetArtSlot`
+`0x5d9480`, `ClearArtSlot` `0x5d9680`, `SelectSlot` `0x5d9820`,
+`GetSelectedSlot` `0x5d9b60`, `SetArtVariant` `0x5d9200`; loops over the 5
+weapon sets in `Clear` `0x5d7d30`, `ReplaceItemId` `0x5d80e0`,
+`FixInventory` `0x5de8a0` and the load path of `Serialize`.
+
+Accesses outside the class found so far: none to these offsets (searched
+`+0xc18..+0xca0`, `+0xd58/+0xd5a`, `(x+0x102)*0xc`, `(x+0xa1)*0x14`,
+`(x*3+0x183)*8`). The compiler also spells addresses in other ways, so the
+list is a lower bound until the callers of the accessors are checked.
+
+### Save format (`cInventoryEntry::Serialize` `0x5dd9f0`)
+
+`(stream, write)`; stream vf04 read, vf08 write, vf14 position. Raw blocks in
+this order, no version field:
+
+flags +0x1162 (2), +0x1164 (2), +0x1166 (2), width (2), height (2),
++0xd5c (0x400), grid (0xc00), **weapon sets (0x78)**, **art slots (0xc8)**,
+**selected (4)**, +0x1168 (4), quest items (count + 8 each), scrolls
+(count + 4 each).
+
+Returns the number of bytes processed. Called from `0x5dbd76`, `0x5df00c`,
+`0x5df0e5`, `0x5df391`, `0x5df47e`, `0x604a26`, `0x604a7d`, `0x605cee`.
+
+### Slot count by level
+
+`SlotCountForLevel` (`0x57f750`): table at `0x95503c`, (level, count) pairs,
+at most 5. Used by the taskbar (`+0x15c`).
+
+### Taskbar (`cUI_Taskbar2`)
+
+Slot controls: weapon sets at +0x164 (5), art slots at +0x178 (5), slot count
+at +0x15c; selection highlight written into the controls (+0x54..+0x60,
++0x78) from `0x9ed058`. Layout, rendering (`0x6e3ac0`), hit test (`0x6dfb10`)
+and drag & drop of the slots: not mapped yet.
+
+### Network
+
+Slot changes send network events 299 (`SetWeaponSetItem`), 300
+(`SetWeaponSet`), 0x129 (`SetArtSlot`), 0x12a (`ClearArtSlot`), 0x130
+(`SelectSlot`), 0x123 (`SetArtVariant`) with the slot index. A server or
+client running the original only knows 5 slots: slots 6-7 are single player
+only (or disabled in multiplayer).
+
+## Plan
+
+1. Slots 6-7 in a DLL table per inventory index (2 weapon sets, 2 x 2 art
+   slot variants); the original object keeps slots 1-5 unchanged.
+2. Hook the accessors above: index >= 5 goes to the table. Extend the
+   5-slot loops (`Clear`, `ReplaceItemId`, `FixInventory`, load fix-up).
+3. Save: after the original blocks, `Serialize` writes an extension block
+   (magic + version + slots 6-7). Reading checks for the magic; a save
+   without it (old save) gets empty slots 6-7 = the migration. Open: whether
+   the stream can peek / seek back, and whether the caller stores the
+   returned length.
+4. Slot count table: 7 entries (unlock levels for slots 6 and 7 to choose).
+5. Taskbar: 7 controls each (arrays inside the object are fixed at 5: own
+   table for the extra controls), layout, rendering, hit tests, drag & drop.
+6. Keys: 1-7 select and cast art slots, F1-F7 select weapon sets.