Remove tools/ (fixture generator) from the repository

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Author: apscot

.gitignore

@@ -6,3 +6,4 @@ build/
 # Local-only notes
 TESTING.md
 RELEASING.md
+tools/

README.md

@@ -654,7 +654,7 @@ cd laya-java
 gradle build
 ```
 
-Tests that need model checkpoints are skipped unless `LAYA_MODEL_DIR`, `LAYA_MODEL_DIR_MULTILINGUAL` and `LAYA_MODEL_DIR_TYPED` point at local checkpoints. A Python script in `tools/` regenerates test fixtures from the reference implementation; it is a development tool and is not part of any published artifact. 
+Tests that need model checkpoints are skipped unless `LAYA_MODEL_DIR`, `LAYA_MODEL_DIR_MULTILINGUAL` and `LAYA_MODEL_DIR_TYPED` point at local checkpoints. The expected values in `laya-core/src/test/resources/fixtures` were generated from the Python `laya-mlx` reference. 
 
 Issues and pull requests are welcome.