fix(e2e): 232 must not require PyYAML

macOS runner 没有 PyYAML,`ModuleNotFoundError: No module named 'yaml'` 让这条新测试
在那台机器上必红。硬依赖一个开发库的测试,最后会被删掉而不是被修好。

改成两档:有 PyYAML 就整份解析(并要求声明了 jobs),没有就退化成针对性 lint ——
正则命中的正是这条测试存在的那个缺陷形态:引号标量闭合后还有内容
(`run: "$BENCH" --list`)。**并且明说跑的是哪一档**:一个悄悄比它所替代的检查更弱的
回落,就是绿色开始失去意义的方式。

两档都验过:干净树上都通过;植入缺陷后**两档都失败**。

Author: speak-agent

tests/e2e/232_workflow_syntax.sh

@@ -14,30 +14,53 @@
 #
 # The check is deliberately syntax-only. Validating the schema would need the
 # full Actions grammar; the failure mode that actually happened is a file that
-# does not parse, and that costs three lines to rule out forever.
+# does not parse, and that costs a few lines to rule out forever.
 set -e
 
 REPO="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
 DIR="$REPO/.github/workflows"
 [ -d "$DIR" ] || { echo "no workflows directory at $DIR"; exit 1; }
 
-count=$(find "$DIR" -maxdepth 1 -name '*.yml' -o -maxdepth 1 -name '*.yaml' | wc -l)
+count=$(find "$DIR" -maxdepth 1 \( -name '*.yml' -o -name '*.yaml' \) | wc -l)
 [ "$count" -gt 0 ] || { echo "no workflow files found under $DIR"; exit 1; }
 
-python3 - "$DIR" <<'PY'
-import pathlib, sys, yaml
+python3 - "$DIR" <<'PYEOF'
+import pathlib, re, sys
+
+# PyYAML is not everywhere — the macOS runner has none, and a test that
+# hard-fails on a missing dev dependency is a test that gets deleted. So: full
+# parse where it exists, targeted lint where it does not, and SAY WHICH RAN. A
+# fallback that is quietly weaker than the check it replaces is how a green
+# stops meaning anything.
+try:
+    import yaml
+    HAVE_YAML = True
+except ImportError:
+    HAVE_YAML = False
+
+# The exact failure this test exists for: a scalar that opens with a quote and
+# carries more content after the closing one —
+#     run: "$BENCH" --list
+# YAML reads that as a quoted scalar followed by garbage and refuses the file.
+TRAILING_AFTER_QUOTED = re.compile(r'^\s*[\w.-]+:\s*"[^"]*"\s*\S')
 
 bad = []
 files = sorted(p for p in pathlib.Path(sys.argv[1]).iterdir()
                if p.suffix in (".yml", ".yaml"))
 for p in files:
+    text = p.read_text()
+    for n, line in enumerate(text.splitlines(), 1):
+        if TRAILING_AFTER_QUOTED.match(line):
+            bad.append(f"{p.name}:{n}: content after a quoted scalar: {line.strip()}")
+    if not HAVE_YAML:
+        continue
     try:
-        doc = yaml.safe_load(p.read_text())
+        doc = yaml.safe_load(text)
     except Exception as e:
         bad.append(f"{p.name}: {e}")
         continue
-    # A workflow with no `jobs` parses but can never do anything — the same
-    # class of silent nothing, so it is reported the same way.
+    # A workflow with no `jobs` parses but can never do anything — the same class
+    # of silent nothing, so it is reported the same way.
     if not isinstance(doc, dict) or not doc.get("jobs"):
         bad.append(f"{p.name}: parsed, but declares no jobs")
 
@@ -46,7 +69,9 @@ if bad:
     for b in bad:
         print("  " + b)
     sys.exit(1)
-print(f"{len(files)} workflow files parse and declare jobs")
-PY
+
+mode = "parsed" if HAVE_YAML else "linted (no PyYAML here — quoted-scalar check only)"
+print(f"{len(files)} workflow files {mode}")
+PYEOF
 
 echo "workflow syntax OK"