feat(embed): add compile-time embedded filesystems

[akonwi]

Summary

• accept ADR 0071 and add the compiler-owned ard/embed module with text, bytes, and static filesystem constructors
• carry captured resources through checked nodes and AIR, then stage native //go:embed artifacts for the Go target
• add embed::FS file, text, directory, stat, and subtree operations with direct io/fs.FS interoperability
• track selected resource inputs in LSP signatures and watched package roots
• document the guide and stdlib API, and serve embedded assets from the chi server example

Validation

• cd compiler && go test ./... -count=1
• cd compiler && gopls check checker/embed.go checker/embed_internal_test.go checker/embed_test.go air/embed_test.go go/embed_test.go lsp/analysis/engine.go lsp/analysis/engine_test.go main_test.go
• cd website && npm run build
• built and ran examples/chi-server, then fetched /static/ and /static/app.css

[vercel]

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Project	Deployment	Actions	Updated
ard-lang-dev	Ready	Preview	Sep 9, 2026 2:08pm UTC