feat(create-expert): Generate Expert Ecosystems with Usability Focus

.changeset/expert-ecosystems.md

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+---
+"create-expert": patch
+---
+
+feat(create-expert): Generate Expert Ecosystems with Usability Focus
+
+Transform create-expert from generating single experts to generating expert ecosystems:
+
+- **Main expert**: Core functionality
+- **Demo expert**: Works immediately with sample data (no setup required)
+- **Setup expert**: Automated configuration wizard (if external deps exist)
+- **Doctor expert**: Troubleshooting assistant (if external deps exist)
+
+Changes:
+- Add usability properties to property-extractor (Zero-Config, Setup-Automation, Error-Guidance)
+- Rename expert-builder to ecosystem-builder with ecosystem generation templates
+- Add usability-manager for PDCA cycle on usability properties
+- Update expert-tester to handle usability stage testing
+- Update report-generator with ecosystem-aware output
+
+Closes #337