Release v3.51.1

chore: add changeset for v3.51.1

Co-authored-by: Roo Code <roomote@roocode.com>

Author: roomote-v0[bot]

.changeset/v3.51.1.md

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+- Feat: Add Cohere Embed v4 model support for Bedrock and improve credential handling (#11823 by @cscvenkatmadurai, PR #11824 by @cscvenkatmadurai)
+- Feat: Add Gemini 3.1 Pro customtools model to Vertex AI provider (PR #11857 by @NVolcz)
+- Feat: Add gpt-5.4 to ChatGPT Plus/Pro (Codex) model catalog (PR #11876 by @roomote-v0)