fix(edu_master): satisfy ruff in schedule scraper

- rename ambiguous loop var, merge nested if (E741, SIM102)
- use tempfile.gettempdir() for debug dump (S108)
- drop unused total_lessons assignment (F841)

edu_master/webinar-checker/checker.py

@@ -3,6 +3,7 @@ import json
 import logging
 import os
 import re
+import tempfile
 import time
 from datetime import datetime, timedelta
 
@@ -545,7 +546,7 @@ def _parse_schedule_cell(cell_html: str) -> list:
         text = text.strip()
         if not text:
             continue
-        lines = [l.strip() for l in text.split('\n') if l.strip()]
+        lines = [ln.strip() for ln in text.split('\n') if ln.strip()]
         if not lines:
             continue
         subject = lines[0] if lines else ''
@@ -599,8 +600,9 @@ def _parse_schedule_html(table_html: str) -> dict:
             continue
 
         first_cell_text = re.sub(r'<[^>]+>', '', cells[0]).strip()
-        if not re.match(r'^\d+\.', first_cell_text):
-            if 'Позакласне' in first_cell_text or re.search(r'colspan\s*=\s*"?(\d+)"?', row):
+        if not re.match(r'^\d+\.', first_cell_text) and (
+            'Позакласне' in first_cell_text or re.search(r'colspan\s*=\s*"?(\d+)"?', row)
+        ):
             continue
 
         lesson_num_match = re.match(r'^(\d+)\.', first_cell_text)
@@ -647,11 +649,11 @@ async def fetch_schedule_data(phpsessid: str) -> dict | None:
                         logger.error('table.schedule-table not found in DOM')
                         return None
 
-                    with contextlib.suppress(Exception), open('/tmp/schedule_debug.html', 'w', encoding='utf-8') as f:
+                    debug_path = os.path.join(tempfile.gettempdir(), 'schedule_debug.html')
+                    with contextlib.suppress(Exception), open(debug_path, 'w', encoding='utf-8') as f:
                         f.write(table_html)
 
                     data = _parse_schedule_html(table_html)
-                    total_lessons = sum(len(entry['classes'].get(c, [])) for day in data['weekdays'].values() for entry in day for c in data['classes'])
                     logger.info(f'Schedule parsed: {len(data["weekdays"])} days, classes={data["classes"]}')
 
                     return data