docs(readme): add Claude Code CTA above the fold (V5 d)

[naorsabag]

Summary

Closes V5 killer-line (d) "Claude Code skill section above the fold" from openhop-launch/03-readme-and-landing.md.

V5 audit flagged that the Claude Code Install instructions sit ~3 viewports down on a 15" laptop. The Claude Code platform badge is above the fold, but a passive badge isn't a "section." Adds a one-line CTA between the hero GIF and the nav, anchored to #install-options:

<p align="center">
  <a href="#install-options"><b>→ Add to Claude Code in one command</b></a>
</p>

So a Claude Code user can jump from "saw the GIF, want it" → install instructions in one click without scrolling.

Not in this PR — V5 (c) is structurally blocked

V5 (c) "Try it live link before any CLI command" can't be cleanly satisfied with the current hero shape:

• The hero command is npx openhop init (per the V1 revert — install-first is intentional)
• There's no hosted playground at v0.1 (see 02-hosted-playground.md)
• A "Try it live" link with nothing to point at would be worse than no link

Will close on its own once 02-hosted-playground.md ships.

Base branch note

Targets docs/readme-v3-badge-colors (PR #127) → stacks under V2 (#126) → V1 (#125) → master. Cascade auto-retargets on each merge.

Test plan

• Verify the CTA scrolls to the Install section on click.
• On a 15" laptop, the CTA is visible above the fold (it's between the GIF and the nav, so it sits ~80% down the hero — adds zero scroll).
• Doesn't break the hero rhythm: tagline → vs-callout → privacy → standard badges → platform badges → GIF → CTA → nav.
• CI green.

🤖 Generated with Claude Code

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