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Compositions are now self-contained: the compiler captures font files and embeds them as woff2 data URIs, eliminating silent render-time fallback when the render environment lacks the author's fonts. Resolution order (each tier falls through to the next): 1. Existing @font-face → use as-is 2. Bundled alias (38 cross-platform mappings) → embed data URI 3. Google Fonts → fetch, cache, embed 4. Local system font → locate on OS, compress to woff2, embed 5. Local @font-face paths → read file, compress, inline as data URI 6. External CDN stylesheets → fetch CSS, extract @font-face, inline 7. Alias map fallback → closest bundled equivalent 8. Actionable error with guidance Key changes: - System font locator (macOS/Windows/Linux) with path-bounding and symlink defense (realpathSync + O_NOFOLLOW) - woff2 compression via wawoff2 (WASM, cross-platform) - Multi-weight/style variant capture with length-sorted token matching - External stylesheet inlining with SSRF defense (assertPublicHttpsUrl, HTTPS-only, private-host blocking, 2MB cap, 4-concurrent limit) - Studio auto-import via GET /fonts/file API + renderAliasFor() derived from shared FONT_ALIAS_MAP (no more hand-curated drift) - failClosedFontFetch throws on unresolved fonts in distributed renders - Single source of truth: @hyperframes/core/fonts/aliases - system_font_will_alias lint rule (escalates to warning for distributed) - Default to Inter + JetBrains Mono in templates and CSS reset