/cost estimate does not account for inference_geo pricing multiplier

When a workspace has \default_inference_geo: \"us\"\ configured (or when requests are made with \inference_geo: \"us\"\), Anthropic applies a 1.1x multiplier to all token pricing categories per the data residency pricing docs.

Claude Code's built-in \/cost\ display does not apply this multiplier. Users in this configuration will see cost estimates that are consistently ~9% lower than what is actually billed.

Affected configurations: Users with \default_inference_geo: \"us\"\ at the workspace level, or any request that explicitly passes \inference_geo: \"us\"\.