Track byte sizes of inline-uploaded files during PreprocessInlineFileInputs and convert them to conservative token estimates (bytes/3). RefFileTokens is threaded through StandardRequest into all OpenAI chat/responses usage builders so returned prompt_tokens/input_tokens reflect the full upstream context cost including attached files.
Extract the compacted-context prompt string into a single function in
promptcompat and add a [context note] block to the injected file wrapper
so the model knows the attached history is compressed context, not new
instructions.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
