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The previous mirror binding (FrameFields<keyof T>) only checked membership: it could not see a TS-side optionality flip (truncated? -> truncated leaves keyof unchanged) or a field added on one side, so the "depends on the TS declaration" claim was overstated. - Promote the inline frame shapes (Namespace, ErrorClass, DoneErrorField, RunMessage, and the two Reply variants) to named interfaces so every frame binds uniformly. - Derive FrameFields from RequiredKeys<T>/OptionalKeys<T>, so `required` and `optional` each accept only that side's keys. An optionality flip or a rename now fails typecheck (verified: flipping LogMessage.truncated to required errors at the constant). - Enumerate EVERY public TypedDict in py/protocol.py in the mirror e2e (not a name list taken from the TS side) and assert both the frame roster and each frame's required/optional sets by exact equality, so a frame or field present on only one side of the wire fails the test.