The build.gradle.kts had an absolute path to a Mac-local JAR with a
"codeflash-runtime" comment, causing add_codeflash_dependency to
short-circuit on every machine. Removed the line and stale JAR so
ensure_runtime handles it correctly at optimization time. Added Gradle
8.12 wrapper so the project builds without requiring system gradle.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>