🔧 chore(ci): extract prepare_repo.sh and clean up workflows

- Extract shared repo-checkout logic into .gitea/ci/prepare_repo.sh,
  removing ~47 lines of duplication from standards-check.yml and test.yml
- Remove unused TEST_WORKSPACE env var from test.yml

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/ci/prepare_repo.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+# Clones or updates the repo to WORKSPACE_DIR/<repo-name> and checks out the
+# target commit. Sets REPO_DIR in $GITHUB_ENV on success.
+#
+# Required env vars (provided by GitHub Actions context):
+#   WORKSPACE_DIR, GITHUB_SERVER_URL, GITHUB_REPOSITORY, github.sha,
+#   github.ref, github.ref_name, github.event.repository.name
+# Optional:
+#   WORKFLOW secret (used as OAuth token for private repos)
+set -euo pipefail
+
+REPO_NAME="${REPO_NAME}"
+REPO_DIR="${WORKSPACE_DIR}/${REPO_NAME}"
+TOKEN="${TOKEN:-}"
+
+if [ -n "$TOKEN" ]; then
+  REPO_URL="https://oauth2:${TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git"
+else
+  REPO_URL="${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git"
+fi
+
+if [ -d "$REPO_DIR" ]; then
+  if [ -d "$REPO_DIR/.git" ]; then
+    cd "$REPO_DIR"
+    git clean -fdx
+    git reset --hard
+    git fetch --all --tags --force --prune --prune-tags
+  else
+    rm -rf "$REPO_DIR"
+  fi
+fi
+
+if [ ! -d "$REPO_DIR/.git" ]; then
+  mkdir -p "$WORKSPACE_DIR"
+  git clone "$REPO_URL" "$REPO_DIR"
+  cd "$REPO_DIR"
+fi
+
+if git -C "$REPO_DIR" cat-file -e "${TARGET_SHA}^{commit}" 2>/dev/null; then
+  git -C "$REPO_DIR" checkout -f "$TARGET_SHA"
+else
+  if [ -n "${TARGET_REF:-}" ]; then
+    git -C "$REPO_DIR" fetch origin "$TARGET_REF"
+    git -C "$REPO_DIR" checkout -f FETCH_HEAD
+  else
+    git -C "$REPO_DIR" checkout -f "$TARGET_REF_NAME"
+  fi
+fi
+
+git config --global --add safe.directory "$REPO_DIR"
+echo "REPO_DIR=$REPO_DIR" >> "$GITHUB_ENV"

.gitea/ci/sync_thirdparty_skills.sh

@@ -105,6 +105,7 @@ tracked_skill_exists() {
   [ -f "codex/skills/$name/SKILL.md" ]
 }
 
+
 cd "$REPO_DIR"
 
 git config user.name "$COMMIT_AUTHOR_NAME"
@@ -163,7 +164,7 @@ while IFS=$'\x1f' read -r source_id snapshot_dir sync_mode source_list skills_su
           echo "ERROR: duplicate third-party skill name: $name" >&2
           exit 1
         fi
-        if [ -d "codex/skills/thirdparty/$name" ] && tracked_skill_exists "$name"; then
+        if tracked_skill_exists "$name"; then
           echo "ERROR: skill name conflict with tracked skill: $name" >&2
           exit 1
         fi
@@ -180,7 +181,7 @@ while IFS=$'\x1f' read -r source_id snapshot_dir sync_mode source_list skills_su
         echo "ERROR: duplicate third-party skill name: $name" >&2
         exit 1
       fi
-      if [ -d "codex/skills/thirdparty/$name" ] && tracked_skill_exists "$name"; then
+      if tracked_skill_exists "$name"; then
         echo "ERROR: skill name conflict with tracked skill: $name" >&2
         exit 1
       fi