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)

frontend/src/stores/chat.ts

@@ -144,7 +144,7 @@ export const useChatStore = defineStore('chat', () => {
 
   function finishStreaming(data?: {
     intent?: string; status?: string; jrxml_length?: number
-    error_msg?: string; natural_explanation?: string; retry_count?: number
+    error_msg?: string; natural_explanation?: string; consult_answer?: string; retry_count?: number
     total_duration_ms?: number; ocr_extraction_result?: any
   }) {
     streaming.value = false
@@ -164,6 +164,7 @@ export const useChatStore = defineStore('chat', () => {
         jrxml_length: data.jrxml_length || 0,
         error_msg: data.error_msg || '',
         natural_explanation: data.natural_explanation || '',
+        consult_answer: data.consult_answer || '',
         retry_count: data.retry_count || 0,
       }
       if (data.ocr_extraction_result) {