Enforce Rust code health gate

scripts/check-rust-code-health.sh

@@ -1,9 +1,9 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+ROOT_DIR="${CRANK_RUST_HEALTH_ROOT:-$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)}"
 
-DEFAULT_MAX_LINES=1000
+DEFAULT_MAX_LINES="${CRANK_RUST_HEALTH_DEFAULT_MAX_LINES:-1000}"
 
 # Existing debt baseline. New files must stay under DEFAULT_MAX_LINES. These
 # files are allowed to exist, but CI fails if they grow further.
@@ -46,7 +46,8 @@ while IFS=: read -r file line _; do
   fi
   lines="$(wc -l < "$file" | tr -d ' ')"
   if (( lines > DEFAULT_MAX_LINES / 2 )); then
-    echo "warning: $rel contains inline tests and has $lines lines; prefer tests/ for integration-style tests" >&2
+    echo "error: $rel contains inline tests and has $lines lines; move integration-style tests to tests/" >&2
+    status=1
   fi
 done < <(
   grep -RIn --include='*.rs' '^[[:space:]]*mod tests[[:space:]]*{' \
@@ -61,7 +62,8 @@ Rust code health failed.
 Rules:
 - new Rust files must stay at or below 1000 lines;
 - existing large files are pinned to the current baseline and must not grow;
-- when touching a large file, prefer extracting modules or moving integration-style tests to tests/.
+- large inline test modules are forbidden outside the legacy allowlist;
+- when touching a large file, extract modules or move integration-style tests to tests/.
 
 EOF
 fi