diff --git a/scripts/check/check-error-helper.mjs b/scripts/check/check-error-helper.mjs
index c226426ab1..6495eb6812 100644
--- a/scripts/check/check-error-helper.mjs
+++ b/scripts/check/check-error-helper.mjs
@@ -42,7 +42,8 @@ const IS_API_ROUTE = /^src\/app\/api\/.+\/route\.tsx?$/;
 export const KNOWN_MISSING_ERROR_HELPER = new Set([
   // --- original open-sse/executors + handlers scope (pre-6A.8) ---
   // --- 6A.8 expanded scope: src/app/api/**/route.ts pre-existing violations ---
-  // TODO(6A.8): pre-existing, triage — route through buildErrorBody()/sanitizeErrorMessage()
+  // (empty — #8233 made open-sse/executors/muse-spark-web.ts import sanitizeErrorMessage,
+  // resolving the last frozen violator; see docs/security/ERROR_SANITIZATION.md)
 ]);
 
 // Import specifiers that count as "uses the error helper" (path ends in utils/error).
diff --git a/tests/unit/sidebar-visibility.test.ts b/tests/unit/sidebar-visibility.test.ts
index 721e00e29b..a1771999ba 100644
--- a/tests/unit/sidebar-visibility.test.ts
+++ b/tests/unit/sidebar-visibility.test.ts
@@ -58,6 +58,7 @@ test("primary sidebar items place limits after cache", () => {
       "context-ultra",
       "context-omniglyph",
       "compression-studio",
+      "compression-exclusions",
       "cli-code",
       "cli-agents",
       "acp-agents",
diff --git a/tests/unit/ui/sidebar-engine-items.test.ts b/tests/unit/ui/sidebar-engine-items.test.ts
index 474e50d863..157ee4d059 100644
--- a/tests/unit/ui/sidebar-engine-items.test.ts
+++ b/tests/unit/ui/sidebar-engine-items.test.ts
@@ -78,11 +78,20 @@ describe("COMPRESSION_CONTEXT_GROUP contains all 4 engine items", () => {
     }
   });
 
-  it("group order is Settings → Combos → engines → Studio", () => {
+  it("group order is Settings → Combos → engines → Studio → Exclusions", () => {
     const ids = itemIds as string[];
     assert.equal(ids[0], "context-settings", "Settings must be first");
     assert.equal(ids[1], "context-combos", "Combos must be second");
-    assert.equal(ids[ids.length - 1], "compression-studio", "Studio must be last");
+    assert.equal(
+      ids[ids.length - 1],
+      "compression-exclusions",
+      "Exclusions must be last"
+    );
+    assert.equal(
+      ids[ids.length - 2],
+      "compression-studio",
+      "Studio must immediately precede Exclusions"
+    );
     // Combos precedes every per-engine page.
     const combosIdx = ids.indexOf("context-combos");
     for (const id of ["context-caveman", "context-rtk", ...ENGINE_IDS]) {