Task 477: Add Test Distribution Chart to Tech-Overview

Status: DONE

Summary

tech-overview.md is the only report with 0 bar charts. Add 1 chart:

1. Test distribution by layer: Rust 497 + TS 3,607 + E2E 256 + Python 442 = 4,802 total. Shows the multi-layer quality assurance strategy.

Plan

1. Write content validation test (TDD red)
2. Add bar chart to tech-overview.md
3. Verify test passes (TDD green)
4. Commit with Task 476

Impact

• Brings tech-overview.md from 0 to 1 bar chart
• Eliminates the last report with 0 charts
• Visualizes the multi-layer test strategy