#310 ANSI compile-file + FUNCLFA build-id gate (LANDED — tracking issue)

Landed in the referenced commit: cl:compile-file / compile-file-pathname over the fasl machinery; FUNCLFA v3 header with sha256(self-exe) build-id; loader refuses mismatched fasls; runtime load dispatches on content magic (fasl/fco/source). Rationale: load stays pure per ANSI (no side-effect fasl writes); compile-file is the producer; asdf orchestrates caching; the build-id makes stale caches fail loud instead of reproducing the #302-#309 identity-split class. Follow-on: bundle asdf.funclfa with the binary and auto-load at boot.