Fix pcap timestamp wrap, ATR-hunt EOF crash, start.bat protocol; tighten launchers + vs_reader

- pd.py ts_from_samplenum: drop c_uint32 truncation + dead sampleOverflowCount
  (pcap timestamps wrapped backwards past ~4.5 min at 16 MHz).
- pd.py handle_atr: guard None reads at EOF (was TypeError (None & 0x80) on a
  capture truncated mid-ATR-hunt).
- start.bat: add --protocol (+ :protocol=T=0 default) to match start.sh's
  mid-session decode; correct the 'flag-for-flag' header comment.
- start.sh: reject --rst/--vcc assigned to the same pin (was unchecked).
- setup.bat: set DEVICE_MSG on blocked/skipped probe so the trailing
  'unknown' message is suppressed.
- vs_reader.py: RESULT now fails on CONCAT / payload mismatch / suspicious
  CLA, not just GARBAGE (OK text unchanged; clean traces stay identical).

start.sh

@@ -189,6 +189,7 @@ check_dup clk  "${CLK}"  rst  "${RST}"
 check_dup clk  "${CLK}"  vcc  "${VCC}"
 check_dup data "${DATA}" rst  "${RST}"
 check_dup data "${DATA}" vcc  "${VCC}"
+check_dup rst  "${RST}"  vcc  "${VCC}"
 
 echo "Channels: clk=${CLK} data=${DATA}${RST:+ rst=${RST}}${VCC:+ vcc=${VCC}}"