feat(create-expert): Add Integration Manager for coordinated testing

[FL4TLiN3]

Summary

Add Integration Manager that coordinates functional and usability testing for expert ecosystems.

Changes

1. integration-manager: New expert that:

   • Coordinates functional-manager and usability-manager in parallel
   • Performs trade-off analysis (security vs usability conflicts)
   • Verifies ecosystem integration (setup → main, doctor diagnostics)
   • Returns holistic quality assessment with combined scoring

2. functional-manager: Consolidates happy-path, unhappy-path, and adversarial managers into one expert that runs all functional tests sequentially

3. Simplified workflow:

   create-expert
   ├── property-extractor
   ├── ecosystem-builder
   ├── integration-manager
   │   ├── functional-manager (happy + unhappy + adversarial)
   │   └── usability-manager (demo + setup + doctor + error-guidance)
   └── report-generator
   

Test Plan

• Verify integration-manager delegates to both functional and usability managers
• Verify functional-manager runs all three test phases sequentially
• Verify integration report includes combined quality scores
• Verify trade-off analysis is generated when conflicts exist

Closes #339

🤖 Generated with Claude Code

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Note

Introduces coordinated testing and simplifies the expert workflow.

• Add integration-manager to orchestrate parallel functional + usability testing, perform trade-off analysis, verify ecosystem integration, and return combined scoring
• Replace happy-path-manager, unhappy-path-manager, and adversarial-manager with consolidated functional-manager (sequential phases)
• Update create-expert workflow and delegates to: property-extractor → ecosystem-builder → integration-manager → report-generator
• Revise instructions and TOML generation in create-expert-toml.ts for new managers, outputs, and reporting format
• Add changeset entry for release notes (.changeset/integration-manager.md)

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