[PATCH v2 0/6] bisect: follow-up fixes from js/bisect-in-c

A trivial update to this topic of follow-up fixes to "bisect", which is now a built-in. See https://lore.kernel.org/git/cover-0.6-00000000000-20221215T094038Z-avarab@gmail.com/ for the v1 & general summary.

Change since v1:

 * Rephrased & updated a commit message which was outdated as of
   f37d0bdd42d, see the range-diff. Thanks to Đoàn Trần Công Danh for
   spotting it.

Johannes Schindelin (5):
  bisect--helper: simplify exit code computation
  bisect: verify that a bogus option won't try to start a bisection
  bisect run: fix the error message
  bisect: remove Cogito-related code
  bisect: no longer try to clean up left-over `.git/head-name` files

Ævar Arnfjörð Bjarmason (1):
  bisect--helper: make the order consistently `argc, argv`

 bisect.c                    |  3 ---
 builtin/bisect.c            | 52 ++++++++++++++-----------------------
 t/t6030-bisect-porcelain.sh | 21 ++++++++++++++-
 3 files changed, 40 insertions(+), 36 deletions(-)

Range-diff against v1:
1:  c8c648e4b8c = 1:  32c45bbf851 bisect--helper: simplify exit code computation
2:  a0de7ad6836 = 2:  1f4449dd081 bisect--helper: make the order consistently `argc, argv`
3:  e1e31278fef = 3:  0cfb7dc572c bisect: verify that a bogus option won't try to start a bisection
4:  59a8a3085b1 ! 4:  4dda1019767 bisect run: fix the error message
    @@ Commit message
     
         However, the error message was supposed to print out whether the state
         was "good" or "bad", but used a bogus (because non-populated) `args`
    -    variable for it. This was fixed in 80c2e9657f2 (bisect--helper: report
    -    actual bisect_state() argument on error, 2022-01-18), but the error
    -    message still talks about `bisect--helper`, which is an implementation
    -    detail that should not concern end users.
    +    variable for it. This was fixed in [1], but as of [2] (when
    +    `bisect--helper` was changed to the present `bisect-state') the error
    +    message still talks about implementation details that should not
    +    concern end users.
     
         Fix that, and add a regression test to ensure that the intended form of
         the error message.
     
    +    1. 80c2e9657f2 (bisect--helper: report actual bisect_state() argument
    +       on error, 2022-01-18
    +    2. f37d0bdd42d (bisect: fix output regressions in v2.30.0, 2022-11-10)
    +
         Helped-by: Elijah Newren <newren@gmail.com>
         Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
         Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
5:  1b70cd79cae = 5:  1600ef41608 bisect: remove Cogito-related code
6:  2ad89aca728 = 6:  817fe726b4b bisect: no longer try to clean up left-over `.git/head-name` files