feat(compat): alexandria load-all.lisp — dependency-ordered loaderVerified

All 16 files load with ZERO errors through this order. io.lisp must
follow macros.lisp: with-open-file* runs ONCE-ONLY at expansion time,
so loading io first produced 5 phantom 'undefined function' errors on
its consumer defuns — the residue that survived two debugging
campaigns (cave#170, the cave#192 trail) until the forward-reference
was spotted. Verified: full load 0 errors; write-string-into-file +
read-file-into-string round-trip on disk ('abc123').

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>