* fix: write fallback package.json for codebase mode to fix nsjail ERR_INVALID_PACKAGE_CONFIG
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* test: add e2e tests for codebase mode with and without nsjail
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>