prmerge-trailer-fixture/fixture.md

PR merge trailer fixture

Poster-authored seed for Arm A and Arm B provider read-back.

Arm A expected generated message-field trailer:

• Co-authored-by: be-coder-07 <[email protected]>

Arm B branch-message trailer:

• Co-authored-by: be-coder-06 <[email protected]>

Absence controls (must not appear in the landed squash object):

• Co-authored-by: absent-arm-a <[email protected]>
• Co-authored-by: absent-arm-b <[email protected]>

Foreign-authored branch change for linked-author generation.