fix: show sidebar on documentation index

[smiggleworth]

Closes #13

Summary

• Route /docs through DocsLayout so the documentation entry point includes the sidebar.
• Restore docs-layout expectations for /docs in static verification.
• Add missing keys to migrated docs navigation and heading lists to remove dev warnings.

Verification

• npm run check ✅
• /docs generated output contains docs layout, sidebar, navigation, and TOC markers ✅
• 338 routes and 32,442 API anchors verified ✅

[Copilot]

Pull request overview

Routes the /docs entry point through the docs shell so the documentation index consistently renders with the docs sidebar/navigation/TOC, updates static-output verification expectations accordingly, and eliminates React missing-key warnings in docs lists.

Changes:

• Register /docs under DocsLayout (instead of the marketing layout) in both runtime and static route registries.
• Update verify-static-output.ts so /docs is treated as a docs route for layout/marker verification.
• Add missing key props to mapped navigation and TOC elements in docs UI.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
src/pages/docs/page.tsx	Adds a key to headings rendering to remove missing-key warnings.
src/pages/docs/_layout.tsx	Adds keys to docs sidebar and TOC list rendering to remove missing-key warnings.
src/pages/_routes.tsx	Routes /docs through DocsLayout by registering all docsCatalog entries (including /docs) under the docs layout.
scripts/verify-static-output.ts	Reclassifies /docs as a docs route in static verification expectations.

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