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* WIP: sync before merging origin/main * fix: unify using/module + build CLI; add missing helper in runner; build passes; core smokes green; jit any.len string now returns 3 * Apply local changes after merging main; keep docs/phase-15 removed per main; add phase-15.1 docs and tests * Remove legacy docs/phase-15/README.md to align with main * integration: add Core-13 pure CI, tests, and minimal LLVM execute bridge (no docs) (#125) Co-authored-by: Tomoaki <tomoaki@example.com> --------- Co-authored-by: Selfhosting Dev <selfhost@example.invalid> Co-authored-by: Tomoaki <tomoaki@example.com>