OpenThread Border Router v2026.08.0

What's Changed

🚀 Features

• [tests] implement (10.4) IPv4 built-in NAT64 connectivity test by @jwhui in #3445
• [tests] increase ping count in TREL_TC_4 expect script by @jwhui in #3455
• [rest] add REST API version in /.well-known/thread for API discovery by @martinzi in #3330
• [doc] rename GEMINI.md to AGENTS.md by @jwhui in #3459
• [github-actions] remove MATN test jobs from workflow by @jwhui in #3454
• [dnssd] deduplicate service instance updates by @jwhui in #3461
• [posix] retry InitMulticastRouterSock on error by @jwhui in #3467
• [rest] avoid variable-length array in Bytes2HexJson by @jwhui in #3474
• [utils] add nullptr guards to Bytes2Hex overloads by @jwhui in #3476
• [ci] fix issues found by zizmor by @bukepo in #3483

🐛 Bug Fixes

• [docker] add die function in setup-host by @lindhe in #3472
• [tests] fix ED_1 state after reset in dind_srp_tc_11 script by @jwhui in #3486
• [tests] fix expect matching order in dind_trel_tc_5.exp by @jwhui in #3490
• [docker] declare secrets in workflow_call trigger by @jwhui in #3492

New Contributors

• @lindhe made their first contribution in #3472

Full Changelog: v2026.07.0...v2026.08.0