ci(checkout-eyrie): use full clone for pinned submodule commits

A depth-1 clone cannot check out a pinned commit if the dependency
repo's main has been rewritten past it (e.g. via squash-merge), and
fails with 'fatal: unable to read tree'. The previous workaround
was to manually bump each submodule pointer in hawk whenever a
squash-merge rewrote a dependency's history. Switching to a full
clone for the pinned-commit path makes the checkout deterministic
without any manual maintenance.

The unpinned-ref path still uses --depth=1 for speed.

Author: Patel230

.github/actions/checkout-eyrie/action.yml

@@ -24,7 +24,11 @@ runs:
           commit=$(git ls-tree HEAD "external/${repo}" | awk '{print $3}' || true)
           if [ -n "$commit" ]; then
             echo "Cloning $repo at submodule commit $commit"
-            git clone --depth=1 "https://github.com/GrayCodeAI/${repo}.git" "$dest"
+            # Full clone so the pinned commit is reachable even after
+            # the dependency repo's main has been rewritten past it
+            # (e.g. by a squash-merge). A depth-1 clone can't check
+            # out older commits and fails with "unable to read tree".
+            git clone "https://github.com/GrayCodeAI/${repo}.git" "$dest"
             (cd "$dest" && git checkout --quiet "$commit")
           else
             ref="${{ inputs.ref }}"