fix: use current model's context window for usage_update size#412

timvisher-dd wants to merge 2 commits intoagentclientprotocol:mainagentclientprotocol/claude-agent-acp:mainfrom

timvisher-dd:timvisher/fix/usage-update-computationtimvisher-dd/claude-agent-acp:timvisher/fix/usage-update-computationCopy head branch name to clipboard