Introduce optional gitCommitInfo as app-wide metadata.

This change adds an optional `gitCommitInfo` string to the app state,
which, if set by the GET_COMMIT_INFO environment variable when the
application is launched, will be displayed in the /about section. 

The `start.sh` and `build_package.sh` scripts set `GET_COMMIT_INFO` to
the most recent git commit's short hash if known, appending the string
"(local modifications)" if additional changes are detected beyond that
point.

packages/cli/src/gemini.ts

@@ -68,12 +68,14 @@ async function main() {
     const readUpResult = await readPackageUp({ cwd: __dirname });
     const cliVersion =
       process.env.CLI_VERSION || readUpResult?.packageJson.version || 'unknown';
+    const gitCommitInfo = process.env.GIT_COMMIT_INFO || 'N/A';
 
     render(
       React.createElement(App, {
         config,
         settings,
         cliVersion,
+        gitCommitInfo,
         startupWarnings,
       }),
     );

packages/cli/src/ui/App.tsx

@@ -50,6 +50,7 @@ interface AppProps {
   config: Config;
   settings: LoadedSettings;
   cliVersion: string;
+  gitCommitInfo?: string;
   startupWarnings?: string[];
 }
 
@@ -57,6 +58,7 @@ export const App = ({
   config,
   settings,
   cliVersion,
+  gitCommitInfo: _gitCommitInfo,
   startupWarnings = [],
 }: AppProps) => {
   const { history, addItem, clearItems } = useHistory();

packages/cli/src/ui/components/AboutBox.tsx

@@ -13,6 +13,7 @@ interface AboutBoxProps {
   osVersion: string;
   sandboxEnv: string;
   modelVersion: string;
+  gitCommitInfo?: string;
 }
 
 export const AboutBox: React.FC<AboutBoxProps> = ({
@@ -20,6 +21,7 @@ export const AboutBox: React.FC<AboutBoxProps> = ({
   osVersion,
   sandboxEnv,
   modelVersion,
+  gitCommitInfo,
 }) => (
   <Box
     borderStyle="round"
@@ -44,6 +46,18 @@ export const AboutBox: React.FC<AboutBoxProps> = ({
         <Text>{cliVersion}</Text>
       </Box>
     </Box>
+    {gitCommitInfo && gitCommitInfo !== 'N/A' && (
+      <Box flexDirection="row">
+        <Box width="35%">
+          <Text bold color={Colors.LightBlue}>
+            Git Commit
+          </Text>
+        </Box>
+        <Box>
+          <Text>{gitCommitInfo}</Text>
+        </Box>
+      </Box>
+    )}
     <Box flexDirection="row">
       <Box width="35%">
         <Text bold color={Colors.LightBlue}>

packages/cli/src/ui/components/HistoryItemDisplay.tsx

@@ -53,6 +53,7 @@ export const HistoryItemDisplay: React.FC<HistoryItemDisplayProps> = ({
         osVersion={item.osVersion}
         sandboxEnv={item.sandboxEnv}
         modelVersion={item.modelVersion}
+        gitCommitInfo={item.gitCommitInfo} // Added this line
       />
     )}
     {item.type === 'tool_group' && (

packages/cli/src/ui/hooks/slashCommandProcessor.ts

@@ -56,6 +56,7 @@ export const useSlashCommandProcessor = (
           osVersion: message.osVersion,
           sandboxEnv: message.sandboxEnv,
           modelVersion: message.modelVersion,
+          gitCommitInfo: message.gitCommitInfo, // Added this line
         };
       } else {
         historyItemContent = {
@@ -176,6 +177,7 @@ export const useSlashCommandProcessor = (
             sandboxEnv = `sandbox-exec (${process.env.SEATBELT_PROFILE || 'unknown'})`;
           }
           const modelVersion = config?.getModel() || 'Unknown';
+          const gitCommitInfo = process.env.GIT_COMMIT_INFO || 'N/A';
 
           addMessage({
             type: MessageType.ABOUT,
@@ -184,6 +186,7 @@ export const useSlashCommandProcessor = (
             osVersion,
             sandboxEnv,
             modelVersion,
+            gitCommitInfo,
           });
         },
       },

packages/cli/src/ui/types.ts

@@ -86,6 +86,7 @@ export type HistoryItemAbout = HistoryItemBase & {
   osVersion: string;
   sandboxEnv: string;
   modelVersion: string;
+  gitCommitInfo?: string;
 };
 
 export type HistoryItemToolGroup = HistoryItemBase & {
@@ -137,6 +138,7 @@ export type Message =
       osVersion: string;
       sandboxEnv: string;
       modelVersion: string;
+      gitCommitInfo?: string;
       content?: string; // Optional content, not really used for ABOUT
     };