test(observability): guard sidebar navigation design

docs/guides/observability_ui_governance.md

@@ -63,6 +63,9 @@ Guard 會檢查：
 - 圖表 `style="height:..."` 與靜態 `style="width:..."`。
 - 過大標題 clamp 與純白 hover/card surface。
 - 觀測台 CSS 必要 token / utility class 是否仍存在。
+- 側欄是否維持 `AI 中樞 → AI 觀測台 → 分組頁面` 的收納結構。
+- 側欄是否維持暖深咖啡背景與第二/三層足夠對比。
+- Topbar 是否仍載入觀測台 CSS 與健康 indicator。
 
 ### 2. Production 10 頁 HTTP 巡檢
 

scripts/check_observability_ui.py

@@ -31,6 +31,8 @@ TEMPLATE_PATHS = [
 ]
 
 CSS_PATH = Path("static/css/observability-system.css")
+SHELL_PATH = Path("templates/components/_ewoooc_shell.html")
+BASE_PATH = Path("templates/ewoooc_base.html")
 
 
 @dataclass(frozen=True)
@@ -92,6 +94,40 @@ REQUIRED_CSS_SNIPPETS = [
     ".obs-table-shell",
 ]
 
+REQUIRED_SHELL_SNIPPETS = [
+    "AI 中樞",
+    "AI 觀測台",
+    "戰情室",
+    "系統與成本",
+    "RAG 與品質",
+    "momo-nav-tree",
+    "momo-nav-subtree",
+    "momo-nav-subtitle",
+    "momo-nav-sublink",
+    "rgba(255, 248, 238, 0.72)",
+    "linear-gradient(180deg",
+]
+
+FORBIDDEN_SHELL_PATTERNS = [
+    Rule(
+        "pure_black_sidebar",
+        re.compile(r"\.momo-sidebar\s*\{[^}]*background\s*:\s*(#000|black)\b", re.IGNORECASE | re.DOTALL),
+        "側欄不得回退成純黑背景；必須維持暖深咖啡漸層。",
+    ),
+    Rule(
+        "low_contrast_sublink",
+        re.compile(r"\.momo-nav-sublink\s*\{[^}]*color\s*:\s*rgba\([^)]*,\s*0\.(?:[0-5][0-9]|60)\)", re.IGNORECASE | re.DOTALL),
+        "第二/三層導覽文字透明度過低，會看不清楚；需維持足夠對比。",
+    ),
+]
+
+REQUIRED_BASE_SNIPPETS = [
+    "observability-system.css",
+    "momo-observability-mode",
+    "/observability/overview",
+    "/observability/api/health_indicator",
+]
+
 
 def line_number(text: str, index: int) -> int:
     return text.count("\n", 0, index) + 1
@@ -129,11 +165,43 @@ def scan_css() -> list[str]:
     return findings
 
 
+def scan_required_snippets(relative_path: Path, snippets: list[str], label: str) -> list[str]:
+    path = ROOT / relative_path
+    if not path.exists():
+        return [f"{relative_path}: missing required {label} file"]
+
+    text = path.read_text(encoding="utf-8")
+    findings: list[str] = []
+    for snippet in snippets:
+        if snippet not in text:
+            findings.append(f"{relative_path}: missing required {label} snippet `{snippet}`")
+    return findings
+
+
+def scan_shell() -> list[str]:
+    path = ROOT / SHELL_PATH
+    if not path.exists():
+        return [f"{SHELL_PATH}: missing required shell file"]
+
+    text = path.read_text(encoding="utf-8")
+    findings = scan_required_snippets(SHELL_PATH, REQUIRED_SHELL_SNIPPETS, "sidebar/nav")
+    for rule in FORBIDDEN_SHELL_PATTERNS:
+        for match in rule.pattern.finditer(text):
+            line = line_number(text, match.start())
+            snippet = match.group(0).replace("\n", " ")[:90]
+            findings.append(
+                f"{SHELL_PATH}:{line}: [{rule.code}] {rule.message} ({snippet})"
+            )
+    return findings
+
+
 def main() -> int:
     findings: list[str] = []
     for template_path in TEMPLATE_PATHS:
         findings.extend(scan_file(Path(template_path)))
     findings.extend(scan_css())
+    findings.extend(scan_shell())
+    findings.extend(scan_required_snippets(BASE_PATH, REQUIRED_BASE_SNIPPETS, "base/topbar"))
 
     if findings:
         print("Observability UI guard: FAIL")
@@ -144,6 +212,8 @@ def main() -> int:
     print("Observability UI guard: PASS")
     print(f"- templates checked: {len(TEMPLATE_PATHS)}")
     print(f"- css guardrails checked: {len(REQUIRED_CSS_SNIPPETS)}")
+    print(f"- sidebar/nav guardrails checked: {len(REQUIRED_SHELL_SNIPPETS)}")
+    print(f"- base/topbar guardrails checked: {len(REQUIRED_BASE_SNIPPETS)}")
     return 0