fix: tool bugs found in review audit

repl:  env var was dead code (hardcoded 2s), empty frame gave misleading error
check-tangle: show full SBCL output on compile failure, not filtered
verify-repl: blacklist now configurable via VERIFY_REPL_EXCLUDE env var;
  regex tightened to ';; +REPL-VERIFIED:' from ';;.REPL.VERIFIED:' (ambiguous)
org-eval: 1-based indexing to match repl-block; errors on out-of-range; errors on <1

projects/check-tangle/check-tangle

@@ -69,7 +69,7 @@ if echo "$OUTPUT" | grep -q ":OK"; then
     echo "OK: $ORG_FILE compiles cleanly" >&2
     exit 0
 else
-    echo "$OUTPUT" | grep -v '^;' | grep -v '^$' | head -5
     echo "FAIL: $ORG_FILE — compilation error" >&2
+    echo "$OUTPUT"
     exit 1
 fi