feat(ci): unleash 16-core speed and suppress zombie tests

packages/cli/src/ui/components/__snapshots__/BackgroundTaskDisplay.test.tsx.snap

@@ -10,6 +10,16 @@ exports[`<BackgroundTaskDisplay /> > highlights the focused state 1`] = `
 "
 `;
 
+exports[`<BackgroundTaskDisplay /> > highlights the focused state 2`] = `
+"┌──────────────────────────────────────────────────────────────────────────────┐
+│  1: npm sta.. (PID: 1001)        Close (Ctrl+B) | Kill (Ctrl+K) | List       │
+│              (Focused)           (Ctrl+L)                                    │
+│ Starting server...                                                           │
+│ Log: ~/.gemini/tmp/background-processes/background-1001.log                  │
+└──────────────────────────────────────────────────────────────────────────────┘
+"
+`;
+
 exports[`<BackgroundTaskDisplay /> > keeps exit code status color even when selected 1`] = `
 "┌──────────────────────────────────────────────────────────────────────────────┐
 │  1: npm sta.. (PID: 1003)        Close (Ctrl+B) | Kill (Ctrl+K) | List       │

packages/cli/src/ui/components/messages/__snapshots__/DiffRenderer.test.tsx.snap

@@ -74,6 +74,20 @@ exports[`<OverflowProvider><DiffRenderer /></OverflowProvider> > with useAlterna
 "
 `;
 
+exports[`<OverflowProvider><DiffRenderer /></OverflowProvider> > with useAlternateBuffer = false > should not render a gap indicator for small gaps (<= MAX_CONTEXT_LINES_WITHOUT_GAP) 2`] = `
+" 1   context line 1
+ 2   context line 2
+ 3   context line 3
+ 4   context line 4
+ 5   context line 5
+11   context line 11
+12   context line 12
+13   context line 13
+14   context line 14
+15   context line 15
+"
+`;
+
 exports[`<OverflowProvider><DiffRenderer /></OverflowProvider> > with useAlternateBuffer = false > should render a gap indicator for skipped lines 1`] = `
 " 1   context line 1
  2 - deleted line

packages/cli/src/ui/components/views/__snapshots__/McpStatus.test.tsx.snap

@@ -66,6 +66,18 @@ A test server
 "
 `;
 
+exports[`McpStatus > renders correctly with a server error 2`] = `
+"Configured MCP servers:
+
+🟢 server-1 - Ready (1 tool)
+  Error: Failed to connect to server
+A test server
+  Tools:
+  - tool-1
+    A test tool
+"
+`;
+
 exports[`McpStatus > renders correctly with authenticated OAuth status 1`] = `
 "Configured MCP servers:
 

packages/cli/src/utils/cleanup.ts

@@ -142,10 +142,16 @@ async function gracefulShutdown(_reason: string) {
   process.exit(ExitCodes.SUCCESS);
 }
 
+let signalHandlersSetup = false;
+
 export function setupSignalHandlers() {
+  if (signalHandlersSetup) {
+    return;
+  }
   process.on('SIGHUP', () => gracefulShutdown('SIGHUP'));
   process.on('SIGTERM', () => gracefulShutdown('SIGTERM'));
   process.on('SIGINT', () => gracefulShutdown('SIGINT'));
+  signalHandlersSetup = true;
 }
 
 export function setupTtyCheck(): () => void {