build_one_sep (per-package compile + .wwi interfaces + link) becomes the sole build path. do_build/do_run/do_test and the ww twins all route through it; --sep is now an accepted no-op and the run-rejects-sep guard is removed. Deleted the single-file amalgamator, both stages: build_one, expand, expand_dir, peek_package (+ the wwstage twins + strictpkgmismatch). unit_has_package is retained -- the sep scan loop's inline-package check needs it. The sep-shared helpers (enumerate_dir_ww, locate_import*, import_path_form, ImportSet, and ww counterparts) stay; they back the surviving sep path. Restores missing-package enforcement under sep by construction: the sep scan loop loudly rejects an unresolvable import (cannot find package <name>) unless the package is defined inline in the same unit -- matching the deleted amalgamator and closing the silent-accept the flip would otherwise introduce. All 5 wwstage tools relink (each is built via the now-sep `ww build`); emitted asm is byte-identical to the combined build per bootstrap input, so the binary md5 delta is pure link layout, not codegen. selfhost/cmd/ww/main.combined.ww is now stale and unregenerable (its writer build_one is deleted); #90 deletes it next. Test retargets folded in (rule-11 carve-out, #61/#133 precedent): each asserts post-flip-only behavior, is un-pre-migratable unlike #93/#94/#103, and splitting reddens one side. Closes #97. - 989_slttypepref -> dir-package layout (xb imports xa so both same-leaf `invalid` types are in scope at xb.f); inline-multipackage was the amalgamator shape, deleted with the flip. - 989_sepbuild_run -> run --sep now genuinely runs (exit 7), not the old loud-reject (exit 2); + a private per-pid WW_PKGCACHE so the cs/ww per-package byte-id compare on the shared real lib pkgs (rt/time/os) no longer races concurrent siblings on the global out/.pkgcache (the flip made sep the sole path, so every test now contends that cache). - 737_direnum -> the deleted strictpkgmismatch "differs from" wording -> sep's "does not match import path" (shared substring, wwstage terser #68). - 989_lib_byteid -> corpus-completeness scan excludes generated .sepwork scratch (the old `! -name '*.combined.ww'` exclude didn't cover the new sep artifact).
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