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New lib/erlang/lists-ext.sx (loaded after runtime.sx): stable merge sort over an SX-list bridge. sort/1 and usort/1 use full Erlang term order via a self-contained er-ext-lt? (deep tuple/list compare that the shared er-lt? lacks); sort/2 takes a fun(A,B)->bool comparator. Registration wraps er-register-builtin-bifs! so the BIFs survive the mid-run registry resets done by tests/runtime.sx. Roadmap is saturated within this loop's scope; this is forever-loop stdlib hardening. New file forced by the broken sx-tree write tools in this worktree (see Blockers) — authored via Write + sx_validate. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>