Adds a new CapturingTransport wrapper in minimateplus.transport that mirrors
every TX/RX byte to two raw .bin files using the same on-wire format as
bridges/ach_mitm.py, so the resulting captures are byte-for-byte compatible
with the existing Blastware MITM captures and load directly in the Analyzer.
A new "Download" tab in seismo_lab.py lets the user connect to a device over
TCP or serial and run connect / list-keys / download-events while the wrapper
saves raw_bw_<ts>.bin (our TX) and raw_s3_<ts>.bin (device TX) into a
seismo_dl_<ts>[_<label>]/ session directory. On completion, the panel hands
both files to the Analyzer and switches tabs, mirroring the UX of the
existing Bridge capture flow.
SESSION_RESET (41 03) is sent before each POLL frame to wake monitoring
units. The ETX lookahead in parse_bw only checked for ACK+STX directly
after ETX, so when 41 03 followed a frame's ETX, the check failed and the
ETX was swallowed into the body as a payload byte — giving a 19-byte body
instead of 17 for POLL frames and failing checksum validation.
Fix: scan past any SESSION_RESET (41 03) sequences when looking for the
next frame start, so the real ACK+STX boundary is found correctly.
Also adds SUM8 checksum validation to parse_s3, which previously left
checksum_valid=None for all S3 frames.
https://claude.ai/code/session_014NczSHUz9uTzCAf4cVASTJ
Claude