Publish PyTorch ExecuTorch report (#701)

* Publish PyTorch ExecuTorch report

* Update README.md

Author: sfmiller1

README.md

@@ -610,6 +610,7 @@ The following clients have engaged Trail of Bits for 5 or more security reviews:
 
 | Product | Date | Level of <br />Effort | Announcement | Report |
 | --- | --: | :-: | --- | :-: |
+| [PyTorch ExecuTorch](https://pytorch.org/projects/executorch/) | Jun 2026 | 9 | [OSTIF](https://ostif.org/pytorch-executorch-audit-complete/)| [📄✅](reviews/2026-06-pytorch-executorch-securityreview.pdf) |
 | [Turnkey Key Management System](https://www.turnkey.com/) | Jun 2026 | 8 | | [📄✅](reviews/2026-06-turnkey-keymanagementsystem-securityreview.pdf) |
 | [Persona Identities Claims Verification](https://withpersona.com/) | May 2026 | 3 | | [🔖](reviews/2026-05-personaidentities-claimsverification-securityreview.pdf) |
 | [PyPI Warehouse](https://warehouse.pypa.io/) | Apr 2026 | 6 | | [📄](reviews/2026-04-pypi-warehouse-securityreview.pdf) |