Добавить общие графики, декодер KONOR и порт STM32 bxCAN

c/set-protocol/docs/GUI_SPECTRUM.md

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+# Shared GUI spectrum
+
+`include/set_spectrum.h` / `src/set_spectrum.c` implement the same numerical
+pipeline for desktop and Android. CMake, `tools/build_host.py`, and the Android
+NDK build include it. The wire protocol is unchanged. The host-only analyzer
+allocates at most two FFT arrays (2×N doubles), releasing them before return.
+
+The last N samples are used: the largest power of two within available data and
+`max_size`, 16…16384. Timestamps are seconds; inputs are immutable. Fs is measured
+from the selected endpoints. Non-monotonic/duplicate times and interval deviations
+over 50% of the mean are rejected. Lesser jitter is linearly interpolated onto an
+even grid (this can affect high-frequency amplitude; inspect returned jitter).
+
+Processing order: interpolation, optional mean subtraction, filter, periodic
+window, forward FFT, one-sided peak amplitude. Windows: rectangular, Hann,
+Hamming, Blackman, Flat Top. Amplitudes are divided by window sum, doubled except
+DC and Nyquist. Output is not RMS/PSD/dB. Coherent gain correction is exact for
+bin-centered tones away from DC/Nyquist; off-bin tones still have scalloping.
+
+Filters run before the window, on the unmodified sample copy. LP/HP are second
+order Butterworth; band pass cascades HP and LP; notch uses Q=30.
+Coefficients: [W3C Audio EQ Cookbook](https://www.w3.org/TR/audio-eq-cookbook/).
+Initial state is the first sample's steady state, not a carried streaming state;
+block-start transients may occur. Cutoffs must be strictly within (0, Fs/2).
+
+## Python
+
+```python
+from protocan.spectrum import NativeSpectrum, Window, Filter
+
+# lib = an existing ctypes.CDLL from protocan.native.NativeProtocol
+spectrum = NativeSpectrum(lib).analyze(times_seconds, values,
+    window=Window.HANN, filter=Filter.LOW_PASS, high_hz=100,
+    max_size=4096, remove_mean=True)
+plot(spectrum.frequencies, spectrum.amplitudes)
+```
+
+Adapter errors are ValueError, not empty/misleading arrays. No NumPy/Qt dependency.
+
+## Android
+
+`SpectrumAnalyzer.analyze(List<TrendPoint>, SpectrumOptions)` calls JNI using
+relative seconds from millisecond timestamps. `TrendSpectrum` contains N, Fs,
+maximum relative jitter, amplitudes or a displayable error. Call on a worker
+dispatcher. `PlotViewport` provides axis-independent zoom/pan, focus anchoring,
+128× limit and bounds clamping without any Compose dependency.
+
+## Checks
+
+Build CMake with tests and run CTest in Debug (assertions enabled). Python
+`tests/test_spectrum.py` runs against an explicitly supplied `SETPROTOCOL_LIBRARY`:
+independent direct DFT, amplitude correction, DC/Nyquist, off-bin leakage, filter
+bands, timing rejection/interpolation, bounded tail selection and immutable inputs.