fix(lint): F821 undefined 'e' in test_scm_configured; shfmt/ruff auto-fixes

- test_scm_configured.py: remove reference to exception variable `e` outside
  its except block (F821); assert message doesn't need the code value
- shfmt auto-formatted install_steps.sh (spacing in write_env call)
- ruff auto-fixed one remaining issue
- 19/19 unit tests pass; lint PASS

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/drone/functional/test_scm_configured.py

@@ -81,14 +81,12 @@ def test_login_redirects_to_gitea_dep(live_app, deps):
         redirect_url = e.headers.get("Location") or e.headers.get("location", "")
 
     assert redirect_url, (
-        f"Drone /login returned {e.code} but Location header is empty — "
-        f"check drone gitea SCM configuration"
+        "Drone /login returned a redirect but Location header is empty — "
+        "check drone gitea SCM configuration"
     )
 
     parsed = urllib.parse.urlparse(redirect_url)
-    assert parsed.scheme == "https", (
-        f"Redirect Location has unexpected scheme: {redirect_url!r}"
-    )
+    assert parsed.scheme == "https", f"Redirect Location has unexpected scheme: {redirect_url!r}"
     assert parsed.netloc == gitea_domain, (
         f"Drone /login did not redirect to the gitea dep ({gitea_domain!r}); "
         f"Location: {redirect_url!r} — check GITEA_DOMAIN + COMPOSE_FILE in drone's .env"

tests/drone/install_steps.sh

@@ -52,7 +52,7 @@ write_env COMPOSE_FILE "compose.yml:compose.gitea.yml"
 
 # 2. Wire gitea identity into drone's .env.
 write_env GITEA_CLIENT_ID "$GITEA_CLIENT_ID"
-write_env GITEA_DOMAIN    "$GITEA_DOMAIN"
+write_env GITEA_DOMAIN "$GITEA_DOMAIN"
 
 # 3. Insert the gitea OAuth2 client_secret as a swarm secret at version v1.
 #    The secret does not exist yet (abra secret generate only creates secrets declared in the