Phase A NNUE: feature-indexing spec, annotation/training pipeline, dump nnuefeatures

Builds out the NNUE Phase A prototype per docs/NNUE.md:

- src/nnuefeatures.c: standalone HalfKAv2_hm feature-index reference
  implementation (new `dump nnuefeatures` command), sourced from
  Stockfish's half_ka_v2_hm.{h,cpp} (sf_16 tag), including the 0x88->64
  square conversion typhoon's own board representation needs.
- annotate_pgns/: sharded TWIC/self-play annotation harness
  (annotate.py), position extraction, quiet-position filtering (flat
  and game-shaped, plus an upstream --prefilter-quiet option),
  train/holdout game-level stratified split, WDL-sigmoid K fitting,
  the Python HalfKAv2_hm reference encoder (nnue_feature_spec.py) and
  its bit-for-bit cross-checker against the C side
  (cross_check_features.py), and a first PyTorch training pipeline
  (nnue_model.py, nnue_train.py, build_training_tensors.py) -- a
  256x2-32-32-1-ish net trained locally on CPU against ~1.85M quiet
  TWIC positions as a pipeline/framework validation pass.
- Finish an in-progress InitMagic/InitLMRTable/InitEval ->
  InitializeBitboardMagic/InitializeLMRTable/InitializeEval rename:
  chess.h's prototypes hadn't been updated to match the already-renamed
  definitions/call sites, leaving 4 implicit-function-declaration
  warnings.
- tests/arasan.epd: new curated EPD suite.
- docs/: add the project's design docs (previously untracked).

Co-Authored-By: Claude Sonnet 5 <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/eval.c b/src/eval.c
index a909953..f0036bd 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -548,7 +548,7 @@ static SCORE ROOK_ON_HALF_OPEN_WITH_FRIEND = 10;
 // instead of rebuilding a local array every call. Not `static const`
 // -- the three source constants are DNA-tunable globals (plain mutable
 // SCORE, not compile-time constants), so this has to be a plain
-// mutable array, rebuilt by InitEval() whenever they change (startup,
+// mutable array, rebuilt by InitializeEval() whenever they change (startup,
 // and after every `evaldna read`), not frozen at compile time.
 static SCORE ROOK_FULL_HALF_OPEN_BONUS[2][2] = { { 16, 9 }, { 10, 0 } };
 
@@ -6584,7 +6584,7 @@ Return value:
 
 
 void
-InitEval(void)
+InitializeEval(void)
 {
     ROOK_FULL_HALF_OPEN_BONUS[0][0] = ROOK_ON_FULL_OPEN;
     ROOK_FULL_HALF_OPEN_BONUS[0][1] = ROOK_ON_HALF_OPEN_WITH_ENEMY;