fix(e2e): deterministic in-range node scenario + log receiver decisions

The sim now observes TX from both nodes (current client fixed observation)
but nothing is ever delivered to the other node. Suspect: random placement
leaving nodes out of range, or the receiver decision. Provide a --from-file
scenario with nodes spaced 10 m apart (guaranteed adjacency) and print the
transmitter -> receivers decision per TX in the sim log.

scripts/meshtasticator_e2e/run_e2e.sh

@@ -93,7 +93,31 @@ start_forwards() {
 }
 
 SIM_LOG="$REPO_ROOT/meshtasticator-sim.log"
-SIM_ARGS=("$NODES" -v)   # -v: meshtastic/debug logging for RF diagnostics
+# Deterministic topology: random placement may leave nodes out of range
+# (nothing was ever delivered between nodes). Provide a --from-file scenario
+# with all nodes within ~10 m of each other so RF adjacency is guaranteed.
+NODE_CONF_DIR="$SIM_DIR/out"
+mkdir -p "$NODE_CONF_DIR"
+"$VENV/bin/python" - "$NODE_CONF_DIR/nodeConfig.yaml" "$NODES" <<'PY'
+import sys
+from pathlib import Path
+
+path, count = sys.argv[1], int(sys.argv[2])
+conf = {}
+for i in range(count):
+    x = float((i - (count - 1) / 2) * 10.0)   # 10 m spacing around the origin
+    conf[i] = {
+        "x": x, "y": 0.0, "z": 1.0,
+        "isRouter": False, "isRepeater": False, "isClientMute": False,
+        "hopLimit": 3, "antennaGain": 0, "neighborInfo": False,
+    }
+Path(path).write_text(
+    "".join(f"{k}:\n" + "".join(f"  {ck}: {cv}\n" for ck, cv in v.items())
+            for k, v in conf.items())
+)
+print(f"wrote deterministic node scenario ({count} nodes) to {path}")
+PY
+SIM_ARGS=("--from-file" -v)   # node count/positions come from nodeConfig.yaml
 if [ "$MODE" = native ]; then
   [ -n "$PROGRAM" ] && [ -d "$PROGRAM" ] || { echo "--mode native needs --program <dir>" >&2; exit 2; }
   SIM_ARGS+=(-p "$PROGRAM")
@@ -159,6 +183,14 @@ new = old + (
 assert old in src, "simulator subscription moved in the pinned meshtasticator"
 src = src.replace(old, new, 1)
 
+old = '            rxs, rssis, snrs = self.calc_receivers(transmitter, receivers)'
+new = old + (
+    '\n            print(f"[sim] TX node={transmitter.nodeid} candidates={[n.nodeid for n in receivers]} '
+    'rxs={[n.nodeid for n in rxs]} rssis={rssis}")'
+)
+assert old in src, "calc_receivers call moved in the pinned meshtasticator"
+src = src.replace(old, new, 1)
+
 interactive.write_text(src)
 print("patched lib/interactive.py (RF instrumentation)")
 PY