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Add a comprehensive "Effects" section to the terminal module documentation in terminal.h explaining the callback system that lets embedding applications react to terminal-initiated events (bell, title changes, pty writes, device queries, etc.). The section includes a reference table of all available effects and their triggers, plus @snippet references to the new example. Add c-vt-effects example project demonstrating how to register write_pty, bell, and title_changed callbacks, attach userdata, and feed VT data that triggers each effect.