feat(assets): backport handbook with per-release versioned docs

[nerdalytics]

Summary

• Backports handbook infrastructure (SvelteKit, components, styles, fonts) from epoch-2
• Adds per-release versioned documentation for all 11 published releases (v1.0.0 through v1000.3.0)
• Each version has its own route directory with immutable content matching the API at that release
• Version selector with fallback to landing page when target version lacks the current page
• Version-specific badges (Socket.dev, static version badge) on each landing page
• Migration guides for every version transition
• Fixes root package.json exports ordering to prevent Vite warnings

Versions documented

Epoch	Versions
0	v1.0.0
1	v1000.0.0, v1000.1.0, v1000.1.1, v1000.2.0, v1000.2.1, v1000.2.2, v1000.2.3, v1000.2.4, v1000.2.5, v1000.3.0

Test plan

• cd handbook && npm ci && npm run build succeeds
• All version landing pages render at /v{version}
• Version selector dropdown switches between versions
• Switching to a version that lacks the current page falls back to landing
• Beacon logo navigates to the active version's landing
• Scroll resets on page navigation
• Content pages match the API surface at each git tag
• Migration guides document every breaking change
• Badges render correctly per version

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​sveltejs/​adapter-auto@​7.0.1
	@​sveltejs/​adapter-static@​3.0.10
	shiki@​4.0.2
	@​sveltejs/​kit@​2.55.0
	@​sveltejs/​vite-plugin-svelte@​6.2.4
	mdsvex@​0.12.7
	vite@​7.3.1
	rehype-slug@​6.0.0
	tailwindcss@​4.2.1
	svelte@​5.53.12
	@​tailwindcss/​vite@​4.2.1
	svelte-check@​4.4.5

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