docs: sync A2A description limits in aggregate OpenAPI

[ysyneu]

Summary

• apply the A2A Agent description maxLength=2000 limit to aggregate OpenAPI specs
• keep safari-specific and aggregate OpenAPI files consistent for SDK generation

Verification

• PATH=/Users/ysy/.nvm/versions/node/v22.12.0/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/Applications/Yunshu.app/Contents/Public:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/Apple/usr/bin:/usr/local/share/dotnet:/usr/local/go/bin:/Users/ysy/.codex/tmp/arg0/codex-arg0tYiUJj:/opt/homebrew/opt/mysql-client/bin:/Users/ysy/.opencode/bin:/Users/ysy/.bun/bin:/Users/ysy/.local/bin:/Users/ysy/.nvm/versions/node/v22.12.0/bin:/Users/ysy/.codeium/windsurf/bin:/Users/ysy/go/bin:/opt/homebrew/bin/:/Users/ysy/.cargo/bin:/Applications/Codex.app/Contents/Resources mint broken-links

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