fix(skills): support git before 2.31 in the worktree hook scripts

.agents/skills/worktrees-pnpm/scripts/refuse-main-checkout.sh

@@ -22,9 +22,13 @@ if [ -n "${CI:-}" ]; then
   exit 0
 fi
 
-dirs=$(git rev-parse --path-format=absolute --git-dir --git-common-dir)
-git_dir=$(printf '%s\n' "$dirs" | sed -n 1p)
-common_dir=$(printf '%s\n' "$dirs" | sed -n 2p)
+# Both paths are resolved physically rather than with
+# `rev-parse --path-format=absolute`, which git before 2.31 rejects. Under
+# `set -e` that rejection would fail the hook everywhere, worktrees included,
+# leaving --no-verify as the only way to commit. `pwd -P` also settles symlinks
+# and relative output, so the comparison is path to path.
+git_dir=$(cd "$(git rev-parse --git-dir)" && pwd -P)
+common_dir=$(cd "$(git rev-parse --git-common-dir)" && pwd -P)
 
 if [ "$git_dir" = "$common_dir" ]; then
   top=$(git rev-parse --show-toplevel)

.agents/skills/worktrees-pnpm/scripts/worktree-remove.sh

@@ -22,7 +22,12 @@ worktree_path=$(printf '%s' "$payload" | jq -r '.worktree_path // empty')
 [ -n "$worktree_path" ] || exit 0
 [ -d "$worktree_path" ] || exit 0
 
-repo_root=$(git -C "$worktree_path" rev-parse --path-format=absolute --git-common-dir 2>/dev/null | xargs dirname) || exit 0
+# Resolved physically rather than with `rev-parse --path-format=absolute`, which
+# git before 2.31 rejects; that failure exited 0 here and silently left every
+# worktree in place. --git-common-dir can print a path relative to the worktree,
+# so it is resolved from inside it.
+common_dir=$(cd "$worktree_path" && cd "$(git rev-parse --git-common-dir 2>/dev/null)" && pwd -P) || exit 0
+repo_root=$(dirname "$common_dir")
 
 # Refuse to discard uncommitted changes. `git worktree remove` without --force
 # already refuses, but check explicitly so the reason is greppable in debug logs.