FN-7065: add deterministic Fusion co-author trailers
Fusion now applies co-author attribution through merge and worktree plumbing instead of relying on prompt-written commit messages.
- Add commit-msg hook support for deterministic Co-authored-by trailers with configured Fusion identity.
- Propagate commit attribution settings through native and worktrunk worktree backends.
- Backfill AI squash merge trailers with Fusion task metadata and co-author attribution.
- Document the settings behavior and add a patch changeset for published CLI behavior.
- Cover hook, executor, AI merge, and real-git trailer behavior with tests.
Files changed:
.changeset/fn-7065-co-author-trailer.md | 7 +++
docs/settings-reference.md | 6 +--
packages/engine/src/__tests__/merger-ai.test.ts | 43 +++++++++++++++++++
.../real-git/commit-msg-trailer.real-git.test.ts | 50 ++++++++++++++++++++++
.../engine/src/__tests__/worktree-hooks.test.ts | 15 +++++++
packages/engine/src/executor.ts | 4 ++
packages/engine/src/merger-ai.ts | 22 ++++++++--
packages/engine/src/step-session-executor.ts | 3 ++
packages/engine/src/worktree-acquisition.ts | 3 ++
packages/engine/src/worktree-backend.ts | 13 +++++-
packages/engine/src/worktree-hooks.ts | 33 +++++++++++++-
11 files changed, 190 insertions(+), 9 deletions(-)
Fusion-Task-Id: FN-7065
Fusion-Task-Lineage: 4f5cd0ff-7193-4f97-bdcd-4cd78c7669b9
31d3f21e18