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Extends esp_backtrace_print_all_tasks() to RISC-V targets. For running tasks, registers are captured using UNW_GET_CONTEXT(); for suspended tasks, the saved RvExcFrame on the task stack is used. Dual-core support follows the same IPC pattern as the Xtensa implementation. Backtrace output adapts to the configured backtrace method: EH-frame, frame-pointer, or register dump (with a hint to enable frame-pointer mode).