Checkpoint the party/runtime stack before share-program and malicious-mode work.

Ship the TLS mesh, composer, Beaver/Yao/leaf MPC, prep/online paths, apps, and docs so the tree is pushable before elevating share_expr, security_mode, and prep resume.

Co-authored-by: Cursor <cursoragent@cursor.com>

examples/grotto/dwt_lut.cpp

@@ -0,0 +1,58 @@
+#include <cmath>
+#include <cstdint>
+#include <iostream>
+#include <vector>
+
+#include "grotto.hpp"
+
+// Haar and bior(5,3) lookup tables (Reis, Ugurbil, Wagh, Henry, de Vega,
+// PoPETs 2025, ePrint 2025/013). The grid is sigmoid on [0, 4), stored as
+// Q4.4. Depth 2 keeps the top 4 bits of a 6-bit index.
+//
+//   c++ -std=c++17 -march=native -I include -I thirdparty examples/grotto/dwt_lut.cpp
+
+int main()
+{
+    //! [dwt-lut]
+    constexpr unsigned domain_bits = 6;
+    constexpr unsigned fractional_bits = 4;
+    constexpr unsigned depth = 2;
+    auto samples = grotto::sample_dwt_signal(domain_bits, fractional_bits,
+        [](double x) {
+            return 1.0 / (1.0 + std::exp(-(x - 2.0)));
+        });
+    auto haar = grotto::make_haar_dwt_lut(samples, fractional_bits, depth);
+    auto bior = grotto::make_bior53_dwt_lut(samples, fractional_bits, depth);
+
+    // Haar is the mean of each block of 2^depth samples, then quantized.
+    const std::uint64_t raw = 32;
+    double block = 0;
+    for (unsigned k = 0; k < 4; ++k)
+        block += samples[(raw & ~std::uint64_t{3}) + k];
+    const auto haar_expect = static_cast<std::int64_t>(
+        std::floor(block / 4.0 * 16.0));
+
+    // bior(5,3), lsb = 0: only the first tap, at index msb+2, divided by 2^j.
+    const std::uint64_t msb = raw >> depth;
+    const auto c0 = bior.coeff[(msb + 2) % bior.coeff.size()];
+    const auto bior_at_32 = c0 / 4;
+
+    // lsb = 1: both taps, weights (2^j - lsb) and lsb, then divide by 2^{2j}.
+    const auto c1 = bior.coeff[(msb + 3) % bior.coeff.size()];
+    const auto bior_at_33 = (c0 * 3 + c1) / 16;
+    //! [dwt-lut]
+
+    if (haar(raw) != haar_expect || haar(raw) != 8)
+    {
+        std::cerr << "haar lut\n";
+        return 1;
+    }
+    if (bior(raw) != bior_at_32 || bior(33) != bior_at_33 || bior(raw) != 8)
+    {
+        std::cerr << "bior lut\n";
+        return 1;
+    }
+
+    std::cout << haar(raw) << " " << bior(raw) << " " << bior(33) << "\n";
+    return 0;
+}