style(scripts): fix ruff F401, F541, F841, E741 in 8 files

- ci-required-drift.py: remove extraneous f-string prefixes (F541 x4)
- lint-curl-status-capture.py: remove unused `sys` import (F401)
- lint_bp_context_emit_match.py: rename ambiguous `l` → `lbl` (E741)
- lint_continue_on_error_tracking.py: remove unused `timedelta` import (F401)
- sop-checklist.py: prefix unused `rejected_unknown` → `_rejected_unknown` (F841),
  rename ambiguous `l` → `lbl` (E741 x2)
- tests/_review_check_fixture.py: prefix unused vars → `_owner`, `_name`, `_team_id` (F841 x3)
- tests/test_lint_pre_flip_continue_on_error.py: remove unused `os` import (F401)
- tests/test_sop_checklist.py: remove unused `tempfile` import (F401)

All checks pass (`ruff check .` clean).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitea/scripts/ci-required-drift.py

@@ -547,12 +547,12 @@ def file_or_update(
 
     if dry_run:
         print(f"::notice::[dry-run] would file/update drift issue for {branch}")
-        print(f"::group::[dry-run] title")
+        print("::group::[dry-run] title")
         print(title)
-        print(f"::endgroup::")
-        print(f"::group::[dry-run] body")
+        print("::endgroup::")
+        print("::group::[dry-run] body")
         print(body)
-        print(f"::endgroup::")
+        print("::endgroup::")
         return
 
     existing = find_open_issue(title)

.gitea/scripts/lint-curl-status-capture.py

@@ -13,7 +13,6 @@ from __future__ import annotations
 import argparse
 import glob
 import re
-import sys
 from pathlib import Path
 from typing import NamedTuple
 

.gitea/scripts/lint_bp_context_emit_match.py

@@ -283,7 +283,7 @@ def _ensure_labels(repo: str, names: list[str]) -> list[int]:
     if status != "ok" or not isinstance(labels, list):
         return []
     out: list[int] = []
-    by_name = {l["name"]: l["id"] for l in labels if isinstance(l, dict)}
+    by_name = {lbl["name"]: lbl["id"] for lbl in labels if isinstance(lbl, dict)}
     for n in names:
         if n in by_name:
             out.append(by_name[n])

.gitea/scripts/lint_continue_on_error_tracking.py

@@ -82,7 +82,7 @@ import sys
 import urllib.error
 import urllib.parse
 import urllib.request
-from datetime import datetime, timedelta, timezone
+from datetime import datetime, timezone
 from pathlib import Path
 from typing import Any
 

.gitea/scripts/sop-checklist.py

@@ -338,7 +338,7 @@ def compute_ack_state(
     # Filter out self-acks and unknown slugs.
     ackers_per_slug: dict[str, list[str]] = {s: [] for s in items_by_slug}
     rejected_self: dict[str, list[str]] = {s: [] for s in items_by_slug}
-    rejected_unknown: dict[str, list[str]] = {s: [] for s in items_by_slug}
+    _rejected_unknown: dict[str, list[str]] = {s: [] for s in items_by_slug}
     pending_team_check: dict[str, list[str]] = {s: [] for s in items_by_slug}
 
     for (user, slug), kind in latest_directive.items():
@@ -842,7 +842,7 @@ def render_status(
 def get_tier_mode(pr: dict[str, Any], cfg: dict[str, Any]) -> str:
     """Read tier label, return 'hard' or 'soft' per cfg.tier_failure_mode."""
     labels = pr.get("labels") or []
-    tier_labels = [l.get("name", "") for l in labels if (l.get("name", "") or "").startswith("tier:")]
+    tier_labels = [lbl.get("name", "") for lbl in labels if (lbl.get("name", "") or "").startswith("tier:")]
     mode_map = cfg.get("tier_failure_mode") or {}
     default_mode = cfg.get("default_mode", "hard")
     for tl in tier_labels:
@@ -865,7 +865,7 @@ def is_high_risk(pr: dict[str, Any], cfg: dict[str, Any]) -> bool:
     Governance fix for internal#442 — closes the inconsistency between
     sop-tier-check (tier-aware) and sop-checklist (was tier-blind).
     """
-    label_set = {(l.get("name") or "") for l in (pr.get("labels") or [])}
+    label_set = {(lbl.get("name") or "") for lbl in (pr.get("labels") or [])}
     if "tier:high" in label_set:
         return True
     high_risk_labels = set(cfg.get("high_risk_labels") or [])

.gitea/scripts/tests/_review_check_fixture.py

@@ -81,7 +81,7 @@ class Handler(http.server.BaseHTTPRequestHandler):
         # GET /repos/{owner}/{name}/pulls/{pr_number}
         m = re.match(r"^/api/v1/repos/([^/]+)/([^/]+)/pulls/(\d+)$", path)
         if m:
-            owner, name, pr_num = m.group(1), m.group(2), m.group(3)
+            _owner, _name, pr_num = m.group(1), m.group(2), m.group(3)
             if sc == "T2_pr_closed":
                 return self._json(200, {
                     "number": int(pr_num),
@@ -151,7 +151,7 @@ class Handler(http.server.BaseHTTPRequestHandler):
         # GET /teams/{team_id}/members/{username}
         m = re.match(r"^/api/v1/teams/(\d+)/members/([^/]+)$", path)
         if m:
-            team_id, login = m.group(1), m.group(2)
+            _team_id, login = m.group(1), m.group(2)
             if sc == "T8_team_not_member":
                 return self._empty(404)
             if sc == "T9_team_403":

.gitea/scripts/tests/test_lint_pre_flip_continue_on_error.py

@@ -15,7 +15,6 @@ Mirrors the pattern in scripts/ops/test_check_migration_collisions.py
 from __future__ import annotations
 
 import importlib.util
-import os
 import sys
 import unittest
 from pathlib import Path

.gitea/scripts/tests/test_sop_checklist.py

@@ -22,7 +22,6 @@ from __future__ import annotations
 
 import os
 import sys
-import tempfile
 import unittest
 
 # Resolve sibling script regardless of where pytest is invoked from.