Luna CE v4.1.1

Luna CE v4.1.1

Corrective release. No change to search or evaluation: the benchmark
node counts are identical to v4.1.0 (depth 18, 1 thread: 590,820 and
980,165).

Fixed

• The Windows executable is now a baseline x86-64 build. The v4.1.0
  luna-v4.1.0-windows-x86_64.exe was built by mistake for the build
  machine's own CPU (POPCNT, LZCNT, BMI1/BMI2 and AVX2 required) and
  failed to start on older CPUs. v4.1.1 needs only SSE3 and CMPXCHG16B;
  the AVX2 NNUE kernel is used at runtime where the CPU supports it.
  .cargo/config.toml no longer sets target-cpu=native.
• Startup messages are now UCI info string lines, so GUIs and tools
  that read the engine's output no longer see non-UCI text before
  uciok.

Added

• UCI option Move Overhead (default 50 ms, range 0-5000 ms). The
  default reproduces the previous behaviour exactly.
• Build and test safeguards: a compile-time check that
  resources/net.bin has the expected size; tests on the embedded
  network (output weights within the SIMD-safe limit; a weight of 129,
  or a file one byte short or long, is rejected); a test that the
  scalar and AVX2 evaluation give identical results on 1,972 distinct
  positions.
• scripts/build_release.ps1 builds the Windows executable and checks
  its CPU features and disassembly (no POPCNT, LZCNT or BMI
  instructions).

Notes

• The eval debug command's output is unchanged.
• The Windows executable was not tested dynamically on a CPU without
  AVX2 or POPCNT.
• Speed of the baseline build compared with a native build was not
  established.
• Release binaries were built from commit 61b7ce2; the tagged commit
  (b703e86) differs from it only in README.md.

Files

• luna-v4.1.1-windows-x86_64.exe (baseline: SSE3 + CMPXCHG16B)
• luna-v4.1.1-linux-aarch64 (needs glibc 2.34 or newer)
• luna-v4.1.1-android-arm64 (built with NDK r27d, API 21)
• SHA256SUMS (all three files; verify with sha256sum -c SHA256SUMS)