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One highlighter for the client: a synchronous fine-grained shiki core (JS regex engine, no WASM) in ui-primitives with an explicit grammar allowlist (typescript, shellscript, json — aliases resolve, unknown languages take a geometry-identical plain arm). The shared CodeBlock component owns both arms; markdown fences, the run_code expanded program body (typescript), and the details panel Input (json) all route through it. Token colors live in a new ui-theme shiki.css sheet as --shiki-* custom properties (light/dark blocks), wired through the shell's base.css chain — tokens-only styling holds; shiki's generated span tree is the sanctioned innerHTML path (static output, no user HTML). jsdom specs pin token spans, aliases, both fallbacks, and the fence route; the built-bundle snapshot asserts the highlighted program under the code row.