V258 - FIXED PLAYER / CHARACTER SLOT ISOLATION
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Fixed slot ownership
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- Player 1 owns only Character Slot / Portrait 1.
- Player 2 owns only Character Slot / Portrait 2.
- The same one-to-one rule continues through Player 6 / Slot 6.
- The account router no longer falls back to a different free character slot.
- A reused network Player N must wait until its old live Character Slot N is empty, then it binds to Slot N only.

Selection and Export isolation
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- In multiplayer, each client can click only its own matching party portrait.
- Other players' portraits/character rows have no View/Edit/Create action for that client.
- Multiplayer portrait drag/reordering is disabled so numbered slots cannot be swapped.
- Export checks the currently displayed Character Record and is allowed only when its slot number matches multiplayerLocalPlayerID and the logged-in account binding.
- The Export panel repeats the same check, preventing a bypass through an already-open panel.
- Player 1/host therefore cannot export Players 2-6, and Players 2-6 cannot export each other or Player 1.

Player leave
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- V257's native Character Arbitration removal remains active.
- A real Player 2-6 leave forces genuine host Player 1 into Character Arbitration once and removes the departed live party character with OnModifyCharacterDelete().
- The permanent account CHR/BIO file is not deleted.
- After removal, the account binding can clear, but the numeric slot remains foreign/unselectable to every other player. It is not inherited by the host.

Preserved behavior
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- V254 one-shot Join protection remains active.
- Standard BG2 Auto-Save and Auto-Save-TOB rows remain disabled through SAVENAME.2DA.
- Native account-bound Import/Export file routing remains in place.
- No automatic character backup, restore, duplicate history, or respawn behavior is added.

Testing
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- RUN_IN_GAME_ACCOUNT_TESTS.bat runs the V258 suite.
- The suite covers fixed Player N -> Slot N assignment, no fallback slot, host/client cross-portrait denial, cross-slot Export denial, leave cleanup, one-shot Arbitration/Join behavior, native Import/Export regression checks, and Auto-Save table handling.
