Add stable CYD firmware, USB calibration wizard and complete setup guide

tests/test_cyd_ui.cpp

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+#include "../cyd_ui.h"
+#include <cassert>
+#include <limits>
+int main() {
+  using cyd::quantize_temperature;
+  assert(quantize_temperature(223, 160, 300, 5) == 225);
+  assert(quantize_temperature(221, 160, 300, 5) == 220);
+  assert(quantize_temperature(-1, 160, 300, 5) == 160);
+  assert(quantize_temperature(999, 160, 299, 5) == 299);
+  assert(quantize_temperature(201, 160, 300, 0) == 201);
+  cyd::TouchGuard g;
+  g.begin(100);
+  assert(!g.accept(120, 1)); // resistive noise pulse
+  assert(g.accept(180, 1));
+  assert(!g.accept(800, 1)); // same physical gesture cannot fire twice
+  g.begin(200);
+  assert(!g.accept(280, 1)); // contact bounce cannot repeat the action
+  g.begin(300);
+  assert(g.accept(380, 2)); // another tile is still responsive
+  g.begin(1000);
+  assert(g.accept(1080, 2));
+  cyd::TouchGuard moving;
+  moving.begin(100, 50, 50);
+  moving.update(52, 48);
+  assert(moving.accept(180, 1)); // small resistive jitter remains usable
+  moving.begin(1000, 50, 50);
+  moving.update(50, 80);
+  moving.update(50, 50);
+  assert(!moving.accept(1200, 2)); // excursion stays cancelled, even on return
+  cyd::TouchGuard rollover;
+  rollover.begin(std::numeric_limits<uint32_t>::max() - 30);
+  assert(rollover.accept(50, 1)); // millis wraps after 49 days
+  rollover.begin(60);
+  assert(!rollover.accept(130, 1));
+}