Moved all components to F.Cu

.devcontainer/Dockerfile

@@ -13,6 +13,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     fpga-icestorm \
     libusb-1.0-0 \
     libftdi1-2 \
+    tshark \
     nodejs npm \
     graphviz \
     poppler-utils \
@@ -30,13 +31,21 @@ ENV VIRTUAL_ENV=/opt/venv
 RUN python3 -m venv "$VIRTUAL_ENV"
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
+# ENV PATH alone is not enough: Debian's /etc/profile REsets PATH unconditionally,
+# so any *login* shell (VS Code's integrated terminal, `su - vscode`, ssh) drops
+# /opt/venv/bin and then `python` does not exist at all (slim has only python3).
+# Re-prepend the venv for login shells so the documented `python -m exi_bba.synth`
+# works everywhere.
+RUN printf 'PATH="%s/bin:$PATH"\nexport PATH\n' "$VIRTUAL_ENV" > /etc/profile.d/10-venv.sh
+
 RUN npm install -g @anthropic-ai/claude-code
 
 COPY requirements.txt /tmp/requirements.txt
 RUN pip install --no-cache-dir -r /tmp/requirements.txt
 
-# pyftdi: programs the FT2232H EEPROM (product string "re-BBA-rb") over libusb.
-RUN pip install --no-cache-dir pyftdi
+# pyftdi: programs the FT2232H EEPROM over libusb, and (with pyserial) reads the
+# FT2232H channel-B UART directly over libusb for bring-up diagnostics.
+RUN pip install --no-cache-dir pyftdi pyserial
 
 RUN useradd -m -u 1000 -s /bin/bash vscode \
  && echo 'vscode ALL=(ALL) NOPASSWD:ALL' > /etc/sudoers.d/vscode \