arch-riscv: Add rvv calibration note[skip ci]

[jueshiwenli]

Change-Id: I8216f2832fc528cd3bb07af9b04fde6d494761a9

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Reviewing files that changed from the base of the PR and between c345ad8 and 62b92f5.

📒 Files selected for processing (2)

• docs/design-docs/vector/README.md
• docs/design-docs/vector/vector-config-decode-block-design.md

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🧪 Generate unit tests (beta)

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• Commit unit tests in branch xs-vector-2605071

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[Copilot]

Pull request overview

Adds design documentation for the RISC-V RVV “vector config instruction blocks younger instructions” behavior in the O3 pipeline, plus a small index README for the vector design-docs folder.

Changes:

• Added a design note describing how isVectorConfig() instructions introduce serialize barriers in Decode and a commit-time squash “safety net”.
• Added docs/design-docs/vector/README.md as an entry point to the vector design docs.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
docs/design-docs/vector/vector-config-decode-block-design.md	New design doc explaining Decode serialize stall + Commit squashAfter fallback for RVV vector-config ordering.
docs/design-docs/vector/README.md	New index README linking to the vector-config decode-block design doc.

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