fix: 7 bugs — parse_mode, /removeplayer, SNo>300, fd leak, warmup sleep, warmup range, dupe print

- cancel_sub: add parse_mode=MARKDOWN_V2 so users don't see literal backslashes
- /removeplayer: add CommandHandler that was advertised in /start but missing from handlers
- parse_standings: raise SNo limit 300→5000 to support large open tournaments
- call_bbp_with_checklist: close mkstemp fd to fix resource leak
- _warmup_cache_sync: make time.sleep(1.0) conditional on HTTP fetch, skip for cache hits
- _warmup_cache_sync: derive start_tnr from max(max_tnr_seen, max cached tnr) instead of hardcoded 1445000
- main: remove duplicate print('Client bot started') after blocking run_polling()

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

swiss_calc/parser.py

@@ -120,7 +120,7 @@ def parse_standings(html: str) -> List[Dict]:
                 continue
 
             sno = int(texts[0])
-            if sno < 1 or sno > 300:
+            if sno < 1 or sno > 5000:
                 continue
 
             # Find name: look for player name (Latin or Cyrillic)