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

[FL4TLiN3]

Context

This is Phase 3 of the create-expert improvement plan. Phase 1+2 (Expert Ecosystems + Usability Properties) is tracked in #337.

Problem

Currently, functional testing (happy/unhappy/adversarial) and usability testing run independently. We need:

1. Coordinated test orchestration
2. Trade-off analysis (functionality vs usability)
3. Holistic quality assessment

Proposed Solution

Add Integration Manager

New expert that coordinates both functional and usability testing:

[experts."integration-manager"]
version = "1.0.0"
description = "Orchestrates coordinated functional and usability testing"
instruction = '''
You coordinate comprehensive testing across both functional and usability dimensions.

## Workflow

1. **Parallel Testing**: Run functional-manager and usability-manager concurrently
2. **Trade-off Analysis**: Identify conflicts (e.g., security vs ease-of-use)
3. **Integration Verification**: Ensure setup expert works with main expert
4. **Holistic Assessment**: Overall quality score across all dimensions

## Output

Integration test report with:
- Functional score (happy/unhappy/adversarial)
- Usability score (fresh-user/setup/demo/recovery)
- Trade-off analysis
- Recommendations for balance
'''
delegates = ["functional-manager", "usability-manager"]

Consolidate Functional Managers

Merge happy-path-manager, unhappy-path-manager, adversarial-manager into one:

[experts."functional-manager"]
version = "1.0.0"
description = "Manages all functional PDCA cycles (happy/unhappy/adversarial)"
instruction = '''
You run comprehensive functional testing across all scenarios.

## PDCA Phases

### Phase 1: Happy Path
- Primary use cases
- Expected inputs
- Normal operation

### Phase 2: Unhappy Path  
- Edge cases
- Invalid inputs
- Error handling

### Phase 3: Adversarial
- Prompt injection
- Path traversal
- Security attacks

Run all phases sequentially, report combined results.
'''
delegates = ["expert-tester"]

Updated Workflow

create-expert
├── property-extractor (functional + usability properties)
├── ecosystem-builder (main + setup + demo + doctor)
├── integration-manager
│   ├── functional-manager (happy + unhappy + adversarial)
│   └── usability-manager (fresh-user + setup + demo + recovery)
└── report-generator (holistic quality report)

Success Criteria

• integration-manager coordinates parallel testing
• functional-manager consolidates 3 managers into 1
• Trade-off analysis identifies security vs usability conflicts
• Integration tests verify setup + main expert work together
• Report includes holistic quality score

Implementation Notes

• Integration-manager should run functional and usability in parallel
• Need conflict resolution strategy when functional and usability requirements clash
• Example trade-off: strict input validation (security) vs auto-correction (usability)

Dependencies

• Requires feat(create-expert): Generate Expert Ecosystems with Usability Focus #337 (Expert Ecosystems + Usability Manager) to be implemented first

[github-actions]

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