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/sample.csv

@@ -0,0 +1,15 @@
+ID,Title,Category,Due Date
+M1,Project Kickoff,Milestones,2025-01-15
+M2,Requirements Complete,Milestones,2025-02-28
+M3,Design Review,Milestones,2025-04-15
+M4,Beta Release,Milestones,2025-06-30
+M5,Launch,Milestones,2025-09-01
+D1,Research Phase,Development,2025-01-20
+D2,Prototype Development,Development,2025-03-10
+D3,Core Features,Development,2025-05-15
+D4,Integration Testing,Development,2025-07-20
+D5,Performance Optimization,Development,2025-08-25
+R1,User Feedback Round 1,Research,2025-02-15
+R2,Market Analysis,Research,2025-04-01
+R3,User Feedback Round 2,Research,2025-06-15
+R4,Final User Testing,Research,2025-08-15