remove: slop docs

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diff --git a/dev_guide/bank.md b/dev_guide/bank.md
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-# Bank system internals
-
-Builder-facing bank documentation (booth object, room placement, player
-commands) lives in [../building_guide/bank.md](../building_guide/bank.md).
-This page covers the engine side.
-
-## Session state
-
-`StateBank` (defined in `internal/net/server.go`) is the session state for
-the bank interface. Input is routed through `handleBankInput` in
-`internal/game/cmd_bank.go`.
-
-## Player storage
-
-Bank items are stored in the `Player.Bank` field (`map[int]*InventorySlot`),
-saved in character YAML. Bank slots are sequential and reuse freed slots.
-There is no slot limit.
-
-## Command dispatch
-
-- `bank` is classified as `ClassActive` in `classifyCommand()`
-- `bank` case in `executeCommand()` calls `doBank(sess)`
-- `doUse()` checks for `"bank"` or `"bank booth"` targets and routes to
-  `doBank()`
-- `doBank()` checks for a `bank_booth` object in the current room
-- `handleBankInput()` dispatches deposit/withdraw/browse/leave commands