nx_b64_cli.nx

nx_b64_cli.nx -- base64 a file to stdout (and optionally to a file). WHY THIS EXISTS: runtime/nx_base64.nx carries a complete b64_encode/b64_decode pair and NO main, so the capability could not be INVOKED -- the same shape as rf_fetch_bank before nx_research_fetch_cli, and the reason evidence work kept stalling on "the bytes are NAS-side and the third-party decoder is laptop-side". A text-safe transport turns any binary artifact (a rendered PNG, an emitted wasm) into something an external validator can be handed, which is exactly what an EXPERIENTIAL witness needs. usage: nx_b64_cli <infile> [outfile] exit 0 ok, 1 usage, 2 unreadable license_tier: ORIGINAL No hw writes (Rule 26). expect_exit: 0