fix(import): show project context error before --code flag validation

Commander's requiredOption() for --code runs before the action handler,
so users outside a project see "required option not specified" instead
of "no agentcore project found". Change to option() so the handler's
project context check (step 1) runs first. The --code validation at
step 5 still catches missing values after project context is confirmed.

Constraint: Commander validates requiredOption before action handlers execute
Rejected: Moving project check into a Commander hook | adds complexity for one flag
Confidence: high
Scope-risk: narrow

Author: jesseturner21

src/cli/commands/import/import-runtime.ts

@@ -507,10 +507,7 @@ export function registerImportRuntime(importCmd: Command): void {
     .command('runtime')
     .description('Import an existing AgentCore Runtime from your AWS account')
     .option('--arn <runtimeArn>', 'Runtime ARN to import')
-    .requiredOption(
-      '--code <path>',
-      'Path to the directory containing the entrypoint file (e.g., the folder with main.py)'
-    )
+    .option('--code <path>', 'Path to the directory containing the entrypoint file (e.g., the folder with main.py)')
     .option('--entrypoint <file>', 'Entrypoint file (auto-detected from runtime, e.g. main.py)')
     .option('--target <target>', 'Deployment target name')
     .option('--name <name>', 'Local name for the imported runtime')