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Add ghostty_mode_report_encode() which encodes a DECRPM response sequence into a caller-provided buffer. The function takes a mode tag, a report state integer, an output buffer, and writes the appropriate CSI sequence (with ? prefix for DEC private modes). The Zig-side ReportState is a non-exhaustive c_int enum that uses std.meta.intToEnum for safe conversion to the internal type, returning GHOSTTY_INVALID_VALUE on overflow. The C header exposes a GhosttyModeReportState enum with named constants for the five standard DECRPM state values.