[PATCH v5 0/2] git-contacts: allow inputting patch via stdin

Make git-contacts accept patches via stdin. Multiple patches may be concatenated together before being passed into git-contacts; git-contacts recognizes the mbox `From ` header inserted by git-format-patch to separate concatenated patches.

Update git-contacts and its corresponding documentation.

---
Changes in v5:
- Add a patch documenting stdin support
- Link to v4: https://patch.msgid.link/20260925-git-contacts-stdin-v4-1-9b4e4bcbb91c@brighamcampbell.com

Changes in v4:
- Don't imply that git-contacts processes input in any particular order
- Link to v3: https://patch.msgid.link/20260923-git-contacts-stdin-v3-1-56dd43c64d56@brighamcampbell.com

Changes in v3:
- Make user pass '-' instead of an empty argv and non-TTY stdin
- Link to v2: https://patch.msgid.link/20260915-git-contacts-stdin-v2-1-2005061d907a@brighamcampbell.com

Changes in v2:
- Minor variable cleanup / un-spaghettification
- Include update to usage comment
- Remove Cc trailers from commit message
- Link to v1: https://patch.msgid.link/20260914-git-contacts-stdin-v1-1-9ac628e6fd20@brighamcampbell.com

To: git@vger.kernel.org
Cc: Junio C Hamano <gitster@pobox.com>
Cc: Patrick Steinhardt <ps@pks.im>
---
Brigham Campbell (2):
      git-contacts: allow inputting patch via stdin
      git-contacts: add stdin functionality to docs

 contrib/contacts/git-contacts      | 9 +++++++--
 contrib/contacts/git-contacts.adoc | 3 ++-
 2 files changed, 9 insertions(+), 3 deletions(-)
---
base-commit: 0f8e75abebff0877cae681a3d5ff31ac47f54220
change-id: 20260914-git-contacts-stdin-1e829930e19b

Thanks!