i4h Catheter Navigation - Smoke Tests

Purpose

Run CPU-only unit smoke tests for fluorosim components and entrypoint parsers, safe for CI without a GPU. Exercises imports, CT->mu preprocessing, parser sanity, and conditional viewport import checks.

Base Code

ROOT="${I4H_WORKFLOWS:-$(git rev-parse --show-toplevel 2>/dev/null)}"
if [ ! -d "$ROOT/workflows/catheter_navigation" ]; then
  ROOT="${I4H_WORKFLOWS:-$HOME/i4h-workflows}"
  [ -d "$ROOT/workflows/catheter_navigation" ] || git clone https://github.com/isaac-for-healthcare/i4h-workflows "$ROOT"
fi
export I4H_WORKFLOWS="$ROOT"; cd "$ROOT"