diff --git a/gitnexus-web/src/components/FileTreePanel.tsx b/gitnexus-web/src/components/FileTreePanel.tsx
index a3c7487a9..6d2a559aa 100644
--- a/gitnexus-web/src/components/FileTreePanel.tsx
+++ b/gitnexus-web/src/components/FileTreePanel.tsx
@@ -389,7 +389,7 @@ export const FileTreePanel = ({ onFocusNode }: FileTreePanelProps) => {
           </div>
 
           {/* File tree */}
-          <div className="scrollbar-thin flex-1 overflow-y-auto py-2">
+          <div className="flex-1 scrollbar-thin overflow-y-auto py-2">
             {fileTree.length === 0 ? (
               <div className="px-3 py-4 text-center text-xs text-text-muted">
                 {t('graph:fileTree.noFilesLoaded')}
@@ -413,7 +413,7 @@ export const FileTreePanel = ({ onFocusNode }: FileTreePanelProps) => {
       )}
 
       {activeTab === 'filters' && (
-        <div className="scrollbar-thin flex-1 overflow-y-auto p-3">
+        <div className="flex-1 scrollbar-thin overflow-y-auto p-3">
           <div className="mb-3">
             <h3 className="mb-2 text-xs font-medium tracking-wide text-text-secondary uppercase">
               {t('graph:fileTree.nodeTypes')}
diff --git a/gitnexus-web/src/components/Header.tsx b/gitnexus-web/src/components/Header.tsx
index 8e8d41d08..a1b777422 100644
--- a/gitnexus-web/src/components/Header.tsx
+++ b/gitnexus-web/src/components/Header.tsx
@@ -247,7 +247,7 @@ export const Header = ({
                             />
                           </div>
                         </div>
-                        <div className="scrollbar-thin min-h-0 flex-1 overflow-y-auto pb-1">
+                        <div className="min-h-0 flex-1 scrollbar-thin overflow-y-auto pb-1">
                           {filteredRepos.length === 0 ? (
                             <div className="px-4 py-3 text-sm text-text-muted">
                               {t('header:noRepositoriesFound', { query: repoSearchQuery })}
diff --git a/gitnexus-web/src/components/ProcessesPanel.tsx b/gitnexus-web/src/components/ProcessesPanel.tsx
index add4c255b..e89074feb 100644
--- a/gitnexus-web/src/components/ProcessesPanel.tsx
+++ b/gitnexus-web/src/components/ProcessesPanel.tsx
@@ -364,7 +364,7 @@ export const ProcessesPanel = () => {
       </div>
 
       {/* Process list */}
-      <div className="scrollbar-thin flex-1 overflow-y-auto">
+      <div className="flex-1 scrollbar-thin overflow-y-auto">
         {/* View All Processes Card */}
         <div className="px-4 py-3">
           <button
diff --git a/gitnexus-web/src/components/QueryFAB.tsx b/gitnexus-web/src/components/QueryFAB.tsx
index 222bd45ab..a23f4afed 100644
--- a/gitnexus-web/src/components/QueryFAB.tsx
+++ b/gitnexus-web/src/components/QueryFAB.tsx
@@ -343,7 +343,7 @@ export const QueryFAB = () => {
           </div>
 
           {showResults && queryResult.rows.length > 0 && (
-            <div className="scrollbar-thin max-h-48 overflow-auto border-t border-border-subtle">
+            <div className="max-h-48 scrollbar-thin overflow-auto border-t border-border-subtle">
               <table className="w-full text-xs">
                 <thead className="sticky top-0 bg-surface">
                   <tr>
diff --git a/gitnexus-web/src/components/RightPanel.tsx b/gitnexus-web/src/components/RightPanel.tsx
index 7038895d8..9b1fa5ab3 100644
--- a/gitnexus-web/src/components/RightPanel.tsx
+++ b/gitnexus-web/src/components/RightPanel.tsx
@@ -301,7 +301,7 @@ export const RightPanel = () => {
           )}
 
           {/* Messages */}
-          <div ref={scrollContainerRef} className="scrollbar-thin flex-1 overflow-y-auto p-4">
+          <div ref={scrollContainerRef} className="flex-1 scrollbar-thin overflow-y-auto p-4">
             {chatMessages.length === 0 ? (
               <div className="flex h-full flex-col items-center justify-center px-4 text-center">
                 <div className="mb-4 flex h-14 w-14 items-center justify-center rounded-xl bg-gradient-to-br from-accent to-node-interface text-2xl shadow-glow">
@@ -426,7 +426,7 @@ export const RightPanel = () => {
                 onKeyDown={handleKeyDown}
                 placeholder={t('chat:input.placeholder')}
                 rows={1}
-                className="scrollbar-thin min-h-[36px] flex-1 resize-none border-none bg-transparent text-sm text-text-primary outline-none placeholder:text-text-muted"
+                className="min-h-[36px] flex-1 resize-none scrollbar-thin border-none bg-transparent text-sm text-text-primary outline-none placeholder:text-text-muted"
                 style={{ height: '36px', overflowY: 'hidden' }}
               />
               <button
diff --git a/gitnexus/test/unit/hooks.test.ts b/gitnexus/test/unit/hooks.test.ts
index 062c5b870..6650780e0 100644
--- a/gitnexus/test/unit/hooks.test.ts
+++ b/gitnexus/test/unit/hooks.test.ts
@@ -2166,7 +2166,12 @@ describe.skipIf(SKIP_LSOF_PATH)(
               cwd: tmpDir,
             },
             undefined,
-            { env: hookEnv(binDir) },
+            {
+              // Owner classification is the subject here. Timeout-wrapper
+              // containment has dedicated coverage and can race these fake
+              // macOS process-table fixtures.
+              env: { ...hookEnv(binDir), GITNEXUS_HOOK_TIMEOUT_PATH: 'disabled' },
+            },
           );
           const output = parseHookOutput(result.stdout);
           expect(output).not.toBeNull();
@@ -2651,7 +2656,12 @@ describe.skipIf(SKIP_LSOF_PATH)(
               cwd: tmpDir,
             },
             undefined,
-            { env: hookEnv(binDir) },
+            {
+              // Owner classification is the subject here. Timeout-wrapper
+              // containment has dedicated coverage and can race these fake
+              // macOS process-table fixtures.
+              env: { ...hookEnv(binDir), GITNEXUS_HOOK_TIMEOUT_PATH: 'disabled' },
+            },
           );
           const output = parseHookOutput(result.stdout);
           expect(output).not.toBeNull();
diff --git a/gitnexus/test/unit/skip-git-cli.test.ts b/gitnexus/test/unit/skip-git-cli.test.ts
index 9163e8692..57ed8e85d 100644
--- a/gitnexus/test/unit/skip-git-cli.test.ts
+++ b/gitnexus/test/unit/skip-git-cli.test.ts
@@ -66,6 +66,10 @@ describe('--skip-git CLI flag', () => {
       ...process.env,
       HOME: gitnexusHome,
       GITNEXUS_HOME: gitnexusHome,
+      // This suite tests repository-root selection, not extension installation.
+      // Keep child CLI runs offline so an unavailable FTS download cannot consume
+      // Vitest's per-test timeout.
+      GITNEXUS_LBUG_EXTENSION_INSTALL: 'never',
     };
 
     try {
@@ -128,6 +132,7 @@ describe('--skip-git CLI flag', () => {
       ...process.env,
       HOME: gitnexusHome,
       GITNEXUS_HOME: gitnexusHome,
+      GITNEXUS_LBUG_EXTENSION_INSTALL: 'never',
     };
 
     try {
@@ -194,6 +199,7 @@ describe('--skip-git CLI flag', () => {
         ...process.env,
         HOME: gitnexusHome,
         GITNEXUS_HOME: gitnexusHome,
+        GITNEXUS_LBUG_EXTENSION_INSTALL: 'never',
       };
     }
 
diff --git a/gitnexus/test/utils/hook-test-helpers.ts b/gitnexus/test/utils/hook-test-helpers.ts
index a7838971a..0500fc790 100644
--- a/gitnexus/test/utils/hook-test-helpers.ts
+++ b/gitnexus/test/utils/hook-test-helpers.ts
@@ -84,6 +84,19 @@ function writeExecutable(filePath: string, content: string) {
   fs.writeFileSync(filePath, content, { mode: 0o755 });
 }
 
+function shellQuote(value: string) {
+  return `'${value.replace(/'/g, `'\\''`)}'`;
+}
+
+function writeImmediateShellExecutable(filePath: string, stdout: string, markerPath?: string) {
+  writeExecutable(
+    filePath,
+    `#!/bin/sh\n` +
+      (markerPath ? `: > ${shellQuote(markerPath)}\n` : '') +
+      `printf %s ${shellQuote(stdout)}\n`,
+  );
+}
+
 export function createHookToolDir(options: {
   gitnexusStderr?: string;
   gitnexusMarkerPath?: string;
@@ -129,6 +142,12 @@ export function createHookToolDir(options: {
     options.lsofOutputLines != null
       ? options.lsofOutputLines.join('\n') + (options.lsofOutputLines.length ? '\n' : '')
       : (options.lsofOutput ?? '');
+  // The owner probe gives lsof one second. Use a shell fixture for immediate
+  // responses so a Node cold start cannot be misclassified as a timed-out
+  // (therefore fail-closed) owner under a heavily parallel test run. The
+  // delay, signal, and PID fixtures below still need a Node process.
+  const immediateLsof =
+    options.lsofSleepMs == null && options.lsofPidFile == null && !options.lsofIgnoreSigterm;
   // Composable prologue: pidFile write MUST stay the first statement (see the
   // option docs above); SIGTERM trap MUST be installed before any sleep.
   const lsofPrologue =
@@ -144,7 +163,11 @@ export function createHookToolDir(options: {
     options.lsofSleepMs != null
       ? `${lsofPrologue}setTimeout(() => {}, ${Number(options.lsofSleepMs)});\n`
       : `${lsofPrologue}process.stdout.write(${JSON.stringify(lsofOutput)});\nprocess.exit(0);\n`;
-  writeExecutable(path.join(binDir, 'lsof'), lsofBody);
+  if (immediateLsof) {
+    writeImmediateShellExecutable(path.join(binDir, 'lsof'), lsofOutput, options.lsofMarkerPath);
+  } else {
+    writeExecutable(path.join(binDir, 'lsof'), lsofBody);
+  }
 
   const psBody =
     options.psOutputByPid != null
@@ -156,7 +179,11 @@ process.stdout.write(byPid[p] ?? '');
 process.exit(0);
 `
       : `#!/usr/bin/env node\nprocess.stdout.write(${JSON.stringify(options.psOutput ?? '')});\nprocess.exit(0);\n`;
-  writeExecutable(path.join(binDir, 'ps'), psBody);
+  if (options.psOutputByPid == null) {
+    writeImmediateShellExecutable(path.join(binDir, 'ps'), options.psOutput ?? '');
+  } else {
+    writeExecutable(path.join(binDir, 'ps'), psBody);
+  }
 
   return binDir;
 }