forth: LSHIFT/RSHIFT + 32-bit arith truncation + early binding (Hayes 174→268)

lib/forth/conformance.sh

@@ -38,11 +38,10 @@ awk '
 
 # 2 + 3: split into chunks at each `}T` and emit as a SX file
 #
-# Cap chunks via MAX_CHUNKS env (default 590) — a small number of later
-# tests enter infinite runtime loops (e.g. COUNT-BITS with unsigned wrap)
-# that our bignum-based interpreter can't terminate. Raise the cap as
-# those tests unblock.
-MAX_CHUNKS="${MAX_CHUNKS:-590}"
+# Cap chunks via MAX_CHUNKS env (default 638 = full Hayes Core). Lower
+# it temporarily if later tests regress into an infinite loop while you
+# are iterating on primitives.
+MAX_CHUNKS="${MAX_CHUNKS:-638}"
 
 MAX_CHUNKS="$MAX_CHUNKS" python3 - "$PREPROC" "$CHUNKS_SX" <<'PY'
 import os, re, sys
@@ -153,11 +152,9 @@ covers tests whose \`->\` / \`}T\` comparison mismatched.
 ### Chunk cap
 
 \`conformance.sh\` processes the first \`\$MAX_CHUNKS\` chunks (default
-**590**). Past that, \`core.fr\` ships tests that rely on unsigned
-integer wrap-around (e.g. \`COUNT-BITS\` using \`BEGIN DUP WHILE … 2*
-REPEAT\`), which never terminates on our bignum-based interpreter. The
-cap should rise as those tests unblock — run with \`MAX_CHUNKS=639
-./conformance.sh\` once they do.
+**638**, i.e. the whole Hayes Core file). Lower the cap temporarily
+while iterating on primitives if a regression re-opens an infinite
+loop in later tests.
 MD
 
 echo "$SUMMARY"