docs: Add QA example specification with Toyota Way quality process

Create comprehensive specification for demonstrating Presentar's
visualization capabilities:

- 50 executable examples (20 YAML-based = 40%)
- 15-point QA checklist (Rendering, Data, Interaction, Performance)
- Covers .apr model files, .ald datasets, charts, dashboards
- Edge cases and stress tests for robustness
- Implementation roadmap (3 phases)

Follows Toyota Way 4P philosophy from entrenar YAML Mode spec.

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

Author: noahgift