{
  "title": "Split scripts/lib/mtk_common.sh under the 250-line cap",
  "objective": "Bring the shared MediaTek library that seven mtk_root scripts source under the cap, using the same entry-point pattern proven on common.sh, without changing any name it exports.",
  "acceptance_criteria": [
    "mtk_common.sh and all three new parts are at most 250 lines.",
    "mtk_common.sh remains the single path every consumer sources; it sources its own parts.",
    "Sourcing it yields exactly the same 28 function names as before, checked after EACH carve rather than only at the end.",
    "`<<<` occurrences are confirmed to be here-strings rather than heredocs before choosing a seam.",
    "The pre-commit shellcheck hook passes on every file, with no new suppression."
  ],
  "out_of_scope": [
    "Executing any mtk_root script; they talk to a phone over USB.",
    "Changing what any helper does.",
    "The other over-cap linux_configuration scripts."
  ],
  "verifier": "A subshell that sources mtk_common.sh and prints `declare -F`, diffed before and after; plus shellcheck -x, meta/scripts/verify_shell_split.sh on two consumers, and check_file_length.sh."
}