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## Why Fast mode previously gated both Fast and Ultra Fast, preventing policies from allowing one while disabling the other. ## What changed - Add the default-enabled `features.ultrafast_mode` flag and enforce it independently of `features.fast_mode` in service-tier selection, requests, and agent prewarming. - Filter TUI service-tier commands and selections by the corresponding policy and model catalog support. - Report `supportsIndependentSpeedModes: true` from `configRequirements/read` and update the protocol schemas and generated bindings. Retain the shared Fast gate when connecting to older servers that omit this capability. - Preserve legacy cloud speed denials by translating `rbac-fast-mode` fragments with `fast_mode = false` into a denial of both modes, while retaining higher-priority enterprise overrides. ## Testing Add coverage for all four Fast/Ultra Fast policy combinations in requirements responses and request routing, agent prewarm inheritance, TUI command visibility and saved selections, and legacy cloud denial normalization and override precedence. GitOrigin-RevId: 147e08524c4b228ea9d46b25a9f8aa64c359e169