Survey (Clojure/JVM var indirection + direct linking, ClojureScript self-host,
nanopass, Guile) and a recommended path to a self-hosting Clojure-in-Clojure
compiler emitting Janet bytecode while keeping REPL redefinition. Key finding:
Janet early-binds top-level refs, so compiled globals must deref through var
cells to stay redefinable. Recommends var-indirection first, then hybrid
fallback, then self-hosting the compiler and shrinking the Janet kernel.
