Lever 1 (native codegen) is built and merged (PRs #143-148): the floor is
localized, cgen translates numeric-leaf fns to C (JOLT_CGEN, 18x on mandelbrot,
cached), and the build-time AOT path deploys native code with no cc. Replaces the
stale START HERE (which still pointed at the now-done spike) with current status
and the open work: jolt-a7ds binary fusion, jolt-v28u while-lowering, jolt-l1l4
grammar widening, jolt-qx70 hot-fn detection.
Co-authored-by: Yogthos <yogthos@gmail.com>
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