selfhost/runtime: Stage 0-1 runner + MIR JSON loader (summary) with trace; compiler: scopebox/loopform prepass wiring (flags, child args); libs: add P1 standard boxes (console/string/array/map) as thin wrappers; runner: pass --box-pref via env; ops_calls dispatcher skeleton; docs: selfhost executor roadmap + scopebox/loopform notes; smokes: selfhost runner + identity prepasses; CURRENT_TASK: update plan and box lib schedule

Cargo.toml

@@ -17,6 +17,10 @@ e2e = []
 cli = []
 plugins-only = []
 builtin-core = []
+## Silence check-cfg warnings for historical cfg guards (kept off by default)
+interpreter-legacy = []
+vm-legacy = []
+phi-legacy = []
 ## JIT-direct only mode: disable legacy VM-arg fallback and plugin-builtins branches
 ## (keeps code compiling; VM-integrated JIT paths remain but are inert)
 jit-direct-only = []