Hojun-Cho
7f2a6aa9f3
amalloc has 0 callers post-γ-2; the *arena threaded through ww driver's importpathform / locatein / locateimport / enumeratedir / peekpackage / arenadupcstr / builddirmodulepath / buildsearchpath / resolvemodule and the expctx.a field are vestigial. Drop `import mem;`, remove expctx.a, strip *arena from 9 signatures, update 9 call sites. Drop 4 dead `let a: *arena = newarena();` in buildone/dobuild/dorun/dotest. Comments retidied. main.combined.ww auto-regenerated. builddirmodulepath body intact — still 0 callers; γ-5b drops it. arenadupcstr name is now a misnomer (task #10). Verified 132/132 incl. 993_ww_ww + 995_self_rebuild byte-identity.