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Add Kitty keyboard protocol negotiation, state stacks, and semantic key encoding with support for alternate keys, event types, associated text, and reporting all keys as escape sequences. Forward key press, repeat, and release events through the terminal worker while preserving legacy input behavior. Keep AltGr composition distinct from Alt shortcuts and correlate SDL text events to prevent missing or duplicated international-layout input. Add protocol documentation and unit coverage for negotiation, state transitions, modifiers, function and keypad keys, shifted input, AltGr composition, repeats, releases, and duplicate suppression.