feat: add Java JRXML-to-PNG rendering pipeline with pixel-level SSIM comparison
- lib/java/: Java renderer (JrxmlRenderer) using JasperReports 6.21.0
- JrxmlDebug for diagnostics, JrxmlGen for format reference
- download_jars.sh for one-time dependency setup
- agent/nodes.py: _render_jrxml_to_png() and _compute_pixel_similarity()
- Pixel comparison integrates into validate node (SSIM < 0.4 fails)
- Pixel fidelity context injected into correct_jrxml for targeted fixes
- tests/test_pixel_comparison.py: 15 unit tests (render, SSIM, integration)
- .gitignore: exclude lib/java/*.jar, lib/java/*.class, tmp/
- CLAUDE.md: v11 changelog documenting the rendering pipeline
- All non-LLM tests pass (97/97)
panda
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