[Bug] System-injected tools and schemas consume excessive tokens without user control

<img width="770" height="439" alt="Image" src="https://github.com/user-attachments/assets/b8eba2b5-cebc-4759-b204-d3ec51f28fd9" />

Bug Description
"What I can't fix: The deferred tools list, skills list, and tool schemas — all system-injected by the harness before my context even loads. Those are the biggest token cost and they're outside project config." I'm absolutely ripping thru tokens because you're forcing me to on every turn. These need to either be accessed in a different way or not subject to customer's tokens. I have gone thru nearly a dozen sessions now reducing my overhead to the lowest possible, but none of it even matters because I can't pull any levers that will actually move the needle any longer. I'm out of cuts to make.

Environment Info

• Platform: win32
• Terminal: windows-terminal
• Version: 2.1.118
• Feedback ID: ff0f289c-d895-41fc-88a6-f19e0a4bba28