SITE: update cmd_tools.py to handle drafting return info

[dwdougherty]

Note

Low Risk
Low risk: changes are limited to documentation generation logic and add tests, with no runtime impact beyond how command markdown is rendered.

Overview
Command page generation now populates the Return information section from command_data.reply_schema instead of always emitting TODO placeholders.

It adds RESP2/RESP3-specific schema-to-reply formatting (including oneOf nesting) with links to protocol spec anchors, fixes Hugo shortcode escaping in the multitabs block, and expands unit tests to cover the new mappings and fallback behavior.

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[github-actions]

DOC-6501

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[andy-stark-redis]

Approved.

[dwdougherty]

Thank you, @andy-stark-redis!