feat: Add Streamlit dashboard with Blueprint compliance (v2.1.0)

Dashboard Features:
- 8 navigation sections: Overview, Outcomes, Poor CX, FCR, Churn, Agent, Call Explorer, Export
- Beyond Brand Identity styling (colors #6D84E3, Outfit font)
- RCA Sankey diagram (Driver → Outcome → Churn Risk flow)
- Correlation heatmaps (driver co-occurrence, driver-outcome)
- Outcome Deep Dive (root causes, correlation, duration analysis)
- Export functionality (Excel, HTML, JSON)

Blueprint Compliance:
- FCR: 4 categories (Primera Llamada/Rellamada × Sin/Con Riesgo de Fuga)
- Churn: Binary view (Sin Riesgo de Fuga / En Riesgo de Fuga)
- Agent: Talento Para Replicar / Oportunidades de Mejora
- Fixed FCR rate calculation (only FIRST_CALL counts as success)

Technical:
- Streamlit + Plotly for interactive visualizations
- Light theme configuration (.streamlit/config.toml)
- Fixed Plotly colorbar titlefont deprecation

Documentation:
- Updated PROJECT_CONTEXT.md, TODO.md, CHANGELOG.md
- Added 4 new technical decisions (TD-014 to TD-017)
- Created TROUBLESHOOTING.md with 10 common issues

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

config/prompts/versions.yaml

@@ -0,0 +1,32 @@
+# ============================================
+# CXInsights - Prompt Version Registry
+# ============================================
+# Active versions for each prompt type
+# ============================================
+
+call_analysis:
+  active: "v2.0"
+  versions:
+    v1.0:
+      description: "Initial MAP prompt - sales + CX + RCA"
+      created: "2024-01-19"
+      status: "deprecated"
+    v2.0:
+      description: "Blueprint-aligned - adds FCR, churn risk, agent assessment"
+      created: "2026-01-19"
+      status: "active"
+      changes:
+        - "Added FCR analysis (first call vs repeat call)"
+        - "Added churn risk classification"
+        - "Added agent skill assessment"
+        - "Enhanced RCALabel with origin and corrective_action"
+        - "Added AgentSkillIndicator model"
+        - "Maximum 5 items per category"
+
+rca_synthesis:
+  active: "v1.0"
+  versions:
+    v1.0:
+      description: "Initial RCA narrative synthesis"
+      created: "2024-01-19"
+      status: "active"