Add 8HP layout with fully automated routing pipeline

- Update PCB to 8HP format (40x100mm) with v2 component placement
- Add automated routing scripts (autoroute.py runs full pipeline headlessly)
- Update panel spec and SVG for 8HP dimensions
- Board routes in <1 second with 0 unconnected pads

Scripts:
- autoroute.py: Full CLI pipeline (place → export → route → import → DRC)
- autoroute_full.py: Same pipeline for KiCad scripting console
- place_8hp.py: Component placement only
- route.sh/freeroute.sh: Routing helpers

hardware/kicad/scripts/route.sh

@@ -0,0 +1,97 @@
+#!/bin/bash
+# Full routing and DRC workflow
+# Usage: ./scripts/route.sh
+#
+# Prerequisites:
+#   1. Run place_8hp.py in KiCad scripting console
+#   2. Export DSN: File → Export → Specctra DSN
+#   3. Save PCB
+
+set -e
+cd "$(dirname "$0")/.."
+
+PCB_FILE="SN-L00.kicad_pcb"
+DSN_FILE="SN-L00.dsn"
+SES_FILE="SN-L00.ses"
+DRC_FILE="DRC.rpt"
+FREEROUTING_JAR="/tmp/freerouting.jar"
+FREEROUTING_URL="https://github.com/freerouting/freerouting/releases/download/v2.0.1/freerouting-2.0.1.jar"
+
+echo "============================================"
+echo "SN-L00 Routing Pipeline"
+echo "============================================"
+
+# Check DSN exists
+if [ ! -f "$DSN_FILE" ]; then
+    echo ""
+    echo "ERROR: $DSN_FILE not found!"
+    echo ""
+    echo "In KiCad:"
+    echo "  1. Run: exec(open('scripts/place_8hp.py').read())"
+    echo "  2. Save: Ctrl+S"
+    echo "  3. Export: File → Export → Specctra DSN"
+    echo ""
+    exit 1
+fi
+
+# Download Freerouting if needed
+if [ ! -f "$FREEROUTING_JAR" ]; then
+    echo "[1/3] Downloading Freerouting..."
+    curl -L -o "$FREEROUTING_JAR" "$FREEROUTING_URL"
+else
+    echo "[1/3] Freerouting ready"
+fi
+
+# Run Freerouting
+echo "[2/3] Running Freerouting..."
+java -jar "$FREEROUTING_JAR" \
+    -de "$DSN_FILE" \
+    -do "$SES_FILE" \
+    -mp 200 \
+    -mt 1 \
+    -oit 2>&1 | grep -E "(completed|INFO.*Auto|ERROR)" || true
+
+if [ ! -f "$SES_FILE" ]; then
+    echo "ERROR: Routing failed - no SES file created"
+    exit 1
+fi
+
+echo "[3/3] Running DRC..."
+echo ""
+echo "============================================"
+echo "In KiCad: File → Import → Specctra Session"
+echo "Select: $SES_FILE"
+echo "Then save (Ctrl+S)"
+echo "============================================"
+echo ""
+echo "Waiting for you to import SES and save..."
+read -p "Press Enter when done: "
+
+# Run DRC from CLI
+kicad-cli pcb drc \
+    --severity-all \
+    --units mm \
+    --schematic-parity \
+    -o "$DRC_FILE" \
+    "$PCB_FILE" 2>&1
+
+echo ""
+echo "============================================"
+echo "DRC Results:"
+echo "============================================"
+grep -E "^(Found|\*\*)" "$DRC_FILE" || cat "$DRC_FILE"
+echo ""
+
+# Count errors vs warnings
+ERRORS=$(grep -c "error$" "$DRC_FILE" 2>/dev/null || echo "0")
+WARNINGS=$(grep -c "warning$" "$DRC_FILE" 2>/dev/null || echo "0")
+
+echo "Summary: $ERRORS errors, $WARNINGS warnings"
+
+if [ "$ERRORS" -eq 0 ]; then
+    echo ""
+    echo "✓ No DRC errors - ready for manufacturing!"
+else
+    echo ""
+    echo "Fix errors and re-run: ./scripts/route.sh"
+fi