refactor(infra): dedupe exec allowlist analysis failure

src/infra/exec-approvals-allowlist.ts

@@ -256,6 +256,14 @@ export function evaluateShellAllowlist(params: {
   autoAllowSkills?: boolean;
   platform?: string | null;
 }): ExecAllowlistAnalysis {
+  const analysisFailure = (): ExecAllowlistAnalysis => ({
+    analysisOk: false,
+    allowlistSatisfied: false,
+    allowlistMatches: [],
+    segments: [],
+    segmentSatisfiedBy: [],
+  });
+
   const chainParts = isWindowsPlatform(params.platform) ? null : splitCommandChain(params.command);
   if (!chainParts) {
     const analysis = analyzeShellCommand({
@@ -265,13 +273,7 @@ export function evaluateShellAllowlist(params: {
       platform: params.platform,
     });
     if (!analysis.ok) {
-      return {
-        analysisOk: false,
-        allowlistSatisfied: false,
-        allowlistMatches: [],
-        segments: [],
-        segmentSatisfiedBy: [],
-      };
+      return analysisFailure();
     }
     const evaluation = evaluateExecAllowlist({
       analysis,
@@ -302,13 +304,7 @@ export function evaluateShellAllowlist(params: {
       platform: params.platform,
     });
     if (!analysis.ok) {
-      return {
-        analysisOk: false,
-        allowlistSatisfied: false,
-        allowlistMatches: [],
-        segments: [],
-        segmentSatisfiedBy: [],
-      };
+      return analysisFailure();
     }
 
     segments.push(...analysis.segments);