feat(codex): implement CLI argument passthrough for codex

Collect unknown CLI arguments from index.ts and pass them through the execution chain (runCodex → loop → CodexSession → codexLocalLauncher → codexLocal), similar to how claude already works. This enables users to pass CLI arguments like --model and --sandbox to the underlying codex process.

Filter out the 'resume' subcommand which is managed internally by hapi, while allowing other CLI arguments to pass through. Add warning log in remote mode when CLI args are ignored since remote mode uses message-based configuration instead. Include unit tests for the resume filtering logic.

cli/src/codex/codexLocal.ts

@@ -2,6 +2,25 @@ import { spawn } from 'node:child_process';
 import { logger } from '@/ui/logger';
 import { restoreTerminalState } from '@/ui/terminalState';
 
+/**
+ * Filter out 'resume' subcommand which is managed internally by hapi.
+ * Codex CLI format is `codex resume <session-id>`, so subcommand is always first.
+ */
+export function filterResumeSubcommand(args: string[]): string[] {
+    if (args.length === 0 || args[0] !== 'resume') {
+        return args;
+    }
+
+    // First arg is 'resume', filter it and optional session ID
+    if (args.length > 1 && !args[1].startsWith('-')) {
+        logger.debug(`[CodexLocal] Filtered 'resume ${args[1]}' - session managed by hapi`);
+        return args.slice(2);
+    }
+
+    logger.debug(`[CodexLocal] Filtered 'resume' - session managed by hapi`);
+    return args.slice(1);
+}
+
 export async function codexLocal(opts: {
     abort: AbortSignal;
     sessionId: string | null;
@@ -9,6 +28,7 @@ export async function codexLocal(opts: {
     model?: string;
     sandbox?: 'read-only' | 'workspace-write' | 'danger-full-access';
     onSessionFound: (id: string) => void;
+    codexArgs?: string[];
 }): Promise<void> {
     const args: string[] = [];
 
@@ -25,6 +45,11 @@ export async function codexLocal(opts: {
         args.push('--sandbox', opts.sandbox);
     }
 
+    if (opts.codexArgs) {
+        const safeArgs = filterResumeSubcommand(opts.codexArgs);
+        args.push(...safeArgs);
+    }
+
     logger.debug(`[CodexLocal] Spawning codex with args: ${JSON.stringify(args)}`);
 
     process.stdin.pause();