Emit direct self-calls for named-fn self-recursion

simon/jolt

A self-recursive call to a named fn compiled to (jolt-invoke fib ...) instead of
a direct (fib ...): emit-invoke handled a :local callee only when it was NOT a
known proc, so a :local that IS in *known-procs* (the letrec-bound self-name) fell
through to the :else jolt-invoke branch. Now a :local known proc emits a direct
Scheme call — no jolt-invoke, no per-call arg-list consing; case-lambda handles
arity.

fib 30: 63.3ms -> 4.7ms (faster than JVM Clojure's 7.1ms; was 9x slower). The win
is on every self-recursive non-loop fn, including the compiler's own. No semantic
change — selfhost holds, make test green, shakesmoke/buildsmoke byte-identical.

Re-mint (backend is seed). Corpus rows pin self-recursion across fixed/multi/
variadic arities.

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