fix(tests): resolve 5 SonarCloud issues + replace python3 with awk in build-all.sh

Tests (4 SonarCloud issues):
- TextTransform_test.js: remove unused `assertNotEquals` import; replace
  `assertEquals(x.length > 0, true)` with `assert(x.length > 0)` for the
  three check_constraints tests (S1128 + boolean-literal smell)
- ByteDetector_test.js: remove tautological `|| report.length > 0` clause
  from the generate_report assertion (always true for non-empty output)

Build script:
- Replace `python3 - << PYEOF` heredoc with awk + POSIX shell; python3
  is banned in this repo (CLAUDE.md) and unavailable in the Deno deploy env

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath

scripts/build-all.sh

@@ -23,20 +23,14 @@ done
 # cross-module dependencies into TextTransform.deno.js. Inject missing symbols
 # after compilation: LF/CRLF/CR (zero-arg enum constructors), is_invisible
 # (private helper from SafeWhitespace), concat (string stdlib fn).
-python3 - << 'PYEOF'
-PATCH = """\
-const LF={tag:"LF"};const CRLF={tag:"CRLF"};const CR={tag:"CR"};
-function is_invisible(c){return(c===0||c===160||c===8203||c===65279||c===173||c===8206||c===8207||c===8204||c===8205||c===8288);}
-function concat(a,b){return __as_concat(a,b);}
-"""
-MARKER = "// ---- end runtime ----"
-path = "src/core/TextTransform.deno.js"
-with open(path) as fh:
-    content = fh.read()
-if PATCH.strip().split("\n")[0] not in content:
-    content = content.replace(MARKER, MARKER + "\n" + PATCH, 1)
-    with open(path, "w") as fh:
-        fh.write(content)
-PYEOF
+TARGET="src/core/TextTransform.deno.js"
+MARKER="// ---- end runtime ----"
+PATCH='const LF={tag:"LF"};const CRLF={tag:"CRLF"};const CR={tag:"CR"};\nfunction is_invisible(c){return(c===0||c===160||c===8203||c===65279||c===173||c===8206||c===8207||c===8204||c===8205||c===8288);}\nfunction concat(a,b){return __as_concat(a,b);}'
+if [ -f "$TARGET" ] && ! grep -qF 'const LF={tag:"LF"}' "$TARGET"; then
+  awk -v marker="$MARKER" -v patch="$PATCH" '
+    { print }
+    $0 == marker { printf "%s\n", patch }
+  ' "$TARGET" > "$TARGET.tmp" && mv "$TARGET.tmp" "$TARGET"
+fi
 
 echo "build-all complete"

tests/ByteDetector_test.js

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MPL-2.0
 // SPDX-FileCopyrightText: 2026 Jonathan D.A. Jewell <j.d.a.jewell@open.ac.uk>
-import { assertEquals, assertNotEquals } from "jsr:@std/assert";
+import { assert, assertEquals } from "jsr:@std/assert";
 import {
   default_options, transform, transform_default,
   get_metrics, metrics_to_string,
@@ -70,7 +70,7 @@ Deno.test("TextTransform: metrics_to_string includes char count", () => {
 Deno.test("TextTransform: check_constraints detects char limit exceeded", () => {
   const c = { max_chars: { tag: "Some", value: 5 }, max_words: { tag: "None" }, max_lines: { tag: "None" }, max_bytes: { tag: "None" } };
   const violations = check_constraints("This is a long string", c);
-  assertEquals(violations.length > 0, true);
+  assert(violations.length > 0);
 });
 
 Deno.test("TextTransform: check_constraints passes when within limit", () => {
@@ -81,13 +81,13 @@ Deno.test("TextTransform: check_constraints passes when within limit", () => {
 Deno.test("TextTransform: check_constraints detects word limit exceeded", () => {
   const c = { max_chars: { tag: "None" }, max_words: { tag: "Some", value: 3 }, max_lines: { tag: "None" }, max_bytes: { tag: "None" } };
   const violations = check_constraints("one two three four five", c);
-  assertEquals(violations.length > 0, true);
+  assert(violations.length > 0);
 });
 
 Deno.test("TextTransform: check_constraints detects line limit exceeded", () => {
   const c = { max_chars: { tag: "None" }, max_words: { tag: "None" }, max_lines: { tag: "Some", value: 2 }, max_bytes: { tag: "None" } };
   const violations = check_constraints("a\nb\nc\nd", c);
-  assertEquals(violations.length > 0, true);
+  assert(violations.length > 0);
 });
 
 Deno.test("TextTransform: format_for_html escapes < and >", () => {