diff --git a/docs/scheduler/ci.md b/docs/scheduler/ci.md
index da1b9b57..74196cd5 100644
--- a/docs/scheduler/ci.md
+++ b/docs/scheduler/ci.md
@@ -41,14 +41,15 @@ gating on the full job's standing warning/suggestion backlog, but flipping
 that switch on the forge is a separate operator action, not something this
 table can assert ahead of it happening.
 
-| Job                           | What it runs                                                                                            | Required?                       |
-| ----------------------------- | ------------------------------------------------------------------------------------------------------- | ------------------------------- |
-| **nix flake check**           | treefmt formatting, `cargo clippy -D warnings`, `cargo test`, module evaluation                         | yes                             |
-| **tracker-tag lint**          | flags `#NNN` issue tags in source and comments (`scripts/check-issue-refs.sh`)                          | yes                             |
-| **comment-block lint**        | flags contiguous comment blocks over 30 lines (`scripts/check-comment-blocks.sh`)                       | yes                             |
-| **doc-pointer lint**          | flags `docs/…md` paths and relative markdown links that no longer resolve (`scripts/check-doc-refs.sh`) | yes                             |
-| **prose lint (vale, errors)** | vale, `docs/` tree, error-severity rule hits only                                                       | not yet — intended to be        |
-| **prose lint (vale)**         | vale, `docs/` tree, full severity range (warnings + suggestions too)                                    | no — advisory, standing backlog |
+| Job                           | What it runs                                                                                                              | Required?                       |
+| ----------------------------- | ------------------------------------------------------------------------------------------------------------------------- | ------------------------------- |
+| **nix flake check**           | treefmt formatting, `cargo clippy -D warnings`, `cargo test`, module evaluation                                           | yes                             |
+| **tracker-tag lint**          | flags `#NNN` issue tags in source and comments (`scripts/check-issue-refs.sh`)                                            | yes                             |
+| **comment-block lint**        | flags contiguous comment blocks over 30 lines (`scripts/check-comment-blocks.sh`)                                         | yes                             |
+| **doc-pointer lint**          | flags `docs/…md` paths and relative markdown links that no longer resolve (`scripts/check-doc-refs.sh`)                   | yes                             |
+| **attribution-trailer lint**  | flags `Co-Authored-By` trailers with Claude/Anthropic attribution in PR commits (`scripts/check-attribution-trailers.sh`) | not yet — intended to be        |
+| **prose lint (vale, errors)** | vale, `docs/` tree, error-severity rule hits only                                                                         | not yet — intended to be        |
+| **prose lint (vale)**         | vale, `docs/` tree, full severity range (warnings + suggestions too)                                                      | no — advisory, standing backlog |
 
 `hive-forge ci-rerun --pr N` dispatches a `workflow_dispatch` retrigger
 without an empty commit.
diff --git a/scripts/check-attribution-trailers.sh b/scripts/check-attribution-trailers.sh
index 152ca251..1eb96dbc 100755
--- a/scripts/check-attribution-trailers.sh
+++ b/scripts/check-attribution-trailers.sh
@@ -12,8 +12,6 @@ set -eu
 
 if [ -n "${GITHUB_BASE_REF:-}" ]; then
   base="origin/${GITHUB_BASE_REF}"
-elif [ -n "${CI_COMMIT_REF_NAME:-}" ]; then
-  base="origin/main"
 else
   base="origin/main"
 fi