refactor: Enhance session management and error handling in AgentService and related components

- Improved session handling by implementing ensureSession to load sessions from disk if not in memory, reducing "session not found" errors.
- Enhanced error messages for non-existent sessions, providing clearer diagnostics.
- Updated CodexProvider and OpencodeProvider to improve error handling and messaging.
- Refactored various routes to use async/await for better readability and error handling.
- Added event emission for merge and stash operations in the MergeService and StashService.
- Cleaned up error messages in AgentExecutor to remove redundant prefixes and ANSI codes for better clarity.

apps/server/src/providers/codex-provider.ts

@@ -876,7 +876,7 @@ export class CodexProvider extends BaseProvider {
           if (errorLower.includes('rate limit')) {
             enhancedError = `${errorText}\n\nTip: You're being rate limited. Try reducing concurrent tasks or waiting a few minutes before retrying.`;
           } else if (errorLower.includes('authentication') || errorLower.includes('unauthorized')) {
-            enhancedError = `${errorText}\n\nTip: Check that your OPENAI_API_KEY is set correctly or run 'codex auth login' to authenticate.`;
+            enhancedError = `${errorText}\n\nTip: Check that your OPENAI_API_KEY is set correctly or run 'codex login' to authenticate.`;
           } else if (
             errorLower.includes('does not exist') ||
             errorLower.includes('do not have access') ||
@@ -1058,7 +1058,6 @@ export class CodexProvider extends BaseProvider {
   async detectInstallation(): Promise<InstallationStatus> {
     const cliPath = await findCodexCliPath();
     const hasApiKey = Boolean(await resolveOpenAiApiKey());
-    await getCodexAuthIndicators();
     const installed = !!cliPath;
 
     let version = '';