docs: use AGENTS.md as root instruction source

[lyzno1]

Summary

• add root AGENTS.md as the canonical agent instruction file
• replace root CLAUDE.md with a symlink to AGENTS.md

Testing

• not run; documentation-only change

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[chatgpt-codex-connector]

💡 Codex Review

vite-plus/CLAUDE.md

Line 1 in 4a06cec

AGENTS.md

Keep CLAUDE.md as a regular file for cross-platform checkouts

Replacing CLAUDE.md with a symlink can break instruction discovery on environments where Git checks out symlinks as plain files (for example when core.symlinks=false, common on Windows), because CLAUDE.md then contains only the literal text AGENTS.md instead of the instruction content. Any tooling that still reads CLAUDE.md directly will lose all repository guidance in that setup, so this introduces a compatibility regression for contributors and automation on those platforms.

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[fengmk2]

Duplicated with #1670