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b3983bc088
Change set_timer_common_ to take std::function<void()>&& instead of by value. This avoids materializing a std::function copy on the stack at each call site — the caller just passes a pointer to the rvalue. On BK7231N (Thumb-1), each forwarder (set_timeout, set_interval) was 118 bytes due to the inlined std::function move constructor + register spilling. With rvalue reference, they shrink to 32 bytes each. All 12 callers already pass rvalues (std::move or lambda temporaries), so this is a purely mechanical change with no semantic difference. BK7231N: forwarders 118 -> 32 bytes each, ~258 bytes saved total ESP32: forwarders 46 -> 30 bytes each, ~20 bytes saved total
