(feat) overhaul landing page: hero install tabs, leaner sections, sharper copy

[alexey-pelykh]

Summary

• Redesign hero with platform tabs (macOS/Linux/WSL | Windows | npm) and "next" channel checkbox with hover tooltip
• Replace "copy" text with clipboard/checkmark icons throughout
• Remove redundant sections: Runtimes (echoed hero tagline), InstallBlock (hero covers install now)
• Trim Features from 6 cards to 2: "Your agent, remotely" + "Bridge, not platform"
• Sharpen feature copy to implicitly differentiate from competitors (no bundled agent, no skill marketplace, no attack surface)
• Update Architecture gateway label from "50 MCP Tools" to "Bridge Middleware"
• Remove stale "Install" nav link
• Add install-next.sh and install-next.ps1 wrapper scripts for the "next" dist-tag channel

Test plan

• Verify platform tabs switch install commands correctly (macOS/Linux/WSL, Windows, npm)
• Verify "next" checkbox toggles all commands to next channel variants
• Verify hover tooltip appears on "next" label
• Verify clipboard icon copies correct command and shows checkmark feedback
• Verify page layout: Hero → Channels → Features (2 cards) → Architecture → Footer
• Verify responsive behavior on mobile

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