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/bbp_wrapper.py

@@ -150,6 +150,7 @@ def call_bbp_with_checklist(
 
     # Also create temp file for checklist
     checklist_fd, checklist_path = tempfile.mkstemp(suffix='.txt')
+    os.close(checklist_fd)
 
     try:
         result = subprocess.run(