Site: real terminal demo (React #32)

[shilpi1958]

Summary

• Terminal demo matches real CLI output (Generating explainer… + save path), not invented ✓ status lines
• Uses a real merged PR example: facebook/react#32 (onInput)
• Explainer preview uses real section names: title, Ships, What changed, Why it matters, Quick check

Stacked on #2 (site/install-init) to avoid conflicting docs/index.html edits.

Test plan

• After Site: scoped install + pr-explainer init #2 merges, merge this into main (or retarget base to main if Site: scoped install + pr-explainer init #2 is already merged)
• Landing “How it works” terminal shows React #32 command and ## Quick check
• No invented ✓ Fetched / ✓ Loaded / ✓ Asking Claude lines

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