Add quantity selection for selling items to ingredient/stone buyers

[Copilot]

Plan: Add quantity selection for selling ingredients and stones

• Explore repository structure and understand the issue
• Locate the relevant code (GourmetManiac, OreManiac, FossilManiac scripts)
• Study Kurt's Apricorn selection code as reference
• Build project successfully to ensure baseline is working
• Create new quantity selection functions for item maniacs (similar to Kurt's apricorn selection)
• Add new "How many" text prompt for item maniacs
• Modify the three maniac scripts to use quantity selection
• Update GetItemManiacPrice to handle quantity
• Update takeitem and money transaction to handle quantity
• Test the changes by building the ROM
• Request code review
• Address code review feedback (carry flag, overflow protection, remove unused code)
• Run security checks
• Use MAX_MONEY constant instead of magic number
• Fix additional code review issues (PopBCDEHL, 16-bit CountItem, 24-bit money syntax)
• Add validation to cap selected quantity at available items
• Fix byte order bug - wBuffer1 is high byte, wBuffer2 is low byte

Summary

Successfully implemented quantity selection for selling items to the three "maniacs" in the game. Fixed critical bug where high/low bytes were swapped when reading CountItem results, which caused the quantity limit to not work correctly. Now properly limits selection to actual items in bag.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Cannot specify number when selling ingredients and stones</issue_title>
<issue_description>Version 3.1.1

Can only sell ingredients to the gourmet Baker and stones to a man in a cave one by one. Cannot specify a number. Is that set deliberately or a bug? When selecting items to be sold, two consequent beep can be heard but I only press once.</issue_description>

<agent_instructions>Maybe code could be reused from giving Kurt Apricorns.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@Rangi42 Yeah, this would be a nice convenience. Maybe code could be reused from giving Kurt Apricorns.

• Fixes Cannot specify number when selling ingredients and stones #1163

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[vulcandth]

@copilot
See my comments.

[vulcandth]

@copilot
You don't limit the the number we can select to the number we actually have in our bag.

[Copilot]

@copilot
You don't limit the the number we can select to the number we actually have in our bag.

Fixed in f4fb96d. The issue was that I had the high/low bytes swapped when reading the CountItem result. CountItem stores the high byte in wBuffer1 and low byte in wBuffer2, but I was reading them in reverse order. Now correctly limits selection to the actual quantity in your bag.

[vulcandth]

Did some tweaking and in-game testing looks good to me.