Wordfish- 4.0.1-260126

Motivation

• Ensure the repository uses the exact requested Stockfish NNUE filenames and downloads/validates them robustly.
• Make the NNUE download/install independent of CWD and fail hard when required tools or validations are missing.
• Add Revolution-compatible Makefile gating so embedding can be disabled and build prerequisites honor that setting.

Description

• Update default BIG NNUE macro in src/evaluate.h to nn-c288c895ea92.nnue while keeping the small net macro unchanged.
• Replace scripts/net.sh with a CWD-independent, fail-fast downloader that auto-detects evaluate.h, requires wget or curl, requires sha256sum/shasum for validation, enforces minimum size thresholds, and creates a symlink into src/ so the build embedding step can find the files. The script validates filename by sha256 prefix and removes invalid downloads.
• Add Revolution-compatible NNUE gating block to src/Makefile (NNUE_EMBEDDING_OFF ?= no) and set NNUE_TARGET := net or empty when embedding is disabled, and replace net prerequisites with $(NNUE_TARGET) for analyze, build, profile-build, and config-sanity, keeping the net target as the wrapper that calls ../scripts/net.sh.
• Adjust engine/network construction in src/engine.cpp to call Networks with EvalFile arguments (matching the Networks constructor signature) instead of trying to construct Network objects inline.
• Convert compile-time FullThreats LUT initialization into a runtime initializer: declare init_threat_offsets() in src/nnue/features/full_threats.h, implement a lazy init_threat_offsets() in src/nnue/features/full_threats.cpp, and move previously-constexpr LUTs into runtime-initialized arrays to avoid constexpr/ABI issues.
• Add ValueList::ssize() and include <cstddef> in src/misc.h for signed sizes used by NNUE accumulator code.

Files changed: src/evaluate.h, scripts/net.sh, src/Makefile, src/engine.cpp, src/misc.h, src/nnue/features/full_threats.h, src/nnue/features/full_threats.cpp.

Testing

• make -C src net — succeeded; both nn-c288c895ea92.nnue and nn-37f18f62d772.nnue were validated and placed under src/nnue/ (the script also created src/ symlinks). (PASS)
• make -C src build — succeeded; build completed and produced src/Wordfish-4.0-230126-sse41popcnt. (PASS)
• UCI smoke test ./src/Wordfish-4.0-230126-sse41popcnt <<'EOF' ... EOF — succeeded; engine printed id/options and logged that it is using nn-c288c895ea92.nnue and nn-37f18f62d772.nnue, then returned a best move. (PASS)
• make -C src -n build — dry-run shows the build calls ../scripts/net.sh and the config output; (PASS)
• make -C src -n build NNUE_EMBEDDING_OFF=yes — dry-run shows -DNNUE_EMBEDDING_OFF present in CXXFLAGS and $(NNUE_TARGET) is empty so net is omitted; (PASS)

All automated steps above completed successfully in the test environment.

Wordfish- 4.0.1-260126

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