feat: add clean timeline example without swimlanes

Created example-1 directory with minimalist timeline template that uses vertical anchor lines to connect items to a central horizontal timeline bar. This demonstrates an alternative visualization style without the swimlane-based layout.

Features:
- Clean template-v2.svg with vertical dashed anchor lines
- Central horizontal timeline bar at y=190
- Items positioned above/below timeline with circle markers
- Minimal styling with clean typography
- 12-month timeline configuration
- Sample data with milestones, development, and research items
- Uses standard ITEM_ID and ITEM_TITLE placeholders

Files:
- template-v2.svg: Clean SVG template with anchor line design
- project.json: Configuration for 12-month timeline
- sample.csv: Sample timeline data with 14 items
- style.css: Minimal CSS styling
- output.svg: Generated timeline (for reference)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

example-1/style.css

@@ -0,0 +1,73 @@
+/* Clean Timeline Example - Minimal Styling */
+
+body {
+  font-family: 'Arial', 'Helvetica', sans-serif;
+  margin: 0;
+  padding: 20px;
+  background-color: #f5f5f5;
+  color: #333;
+}
+
+#svgContainer {
+  background: white;
+  border-radius: 8px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+  padding: 20px;
+  margin: 20px auto;
+  max-width: 100%;
+  overflow-x: auto;
+}
+
+/* SVG styling enhancements */
+svg {
+  display: block;
+  max-width: 100%;
+  height: auto;
+}
+
+/* Timeline elements */
+.months text {
+  font-family: 'Arial', sans-serif;
+  font-size: 11px;
+  fill: #666;
+}
+
+.timeline-content line {
+  stroke: #333;
+}
+
+.timeline-content circle {
+  cursor: pointer;
+  transition: r 0.2s ease;
+}
+
+.timeline-content circle:hover {
+  r: 6;
+}
+
+.timeline-content text {
+  font-family: 'Arial', sans-serif;
+  font-size: 12px;
+  fill: #333;
+}
+
+.item-id {
+  font-weight: 600;
+  fill: #4a90e2;
+}
+
+.item-title {
+  fill: #333;
+}
+
+/* Responsive container */
+@media (max-width: 768px) {
+  body {
+    padding: 10px;
+  }
+
+  #svgContainer {
+    padding: 10px;
+    margin: 10px auto;
+  }
+}