feat(health): Implement comprehensive healthcare organization plugin with conductor methodology

## Summary

Implement comprehensive health plugin for healthcare organization workflows using conductor-based development methodology. This plugin provides 34 specialized skills and 19 commands covering clinical, administrative, financial, and research domains with full regulatory compliance.

## Motivation

Healthcare organizations require specialized Claude Code support for:
- Complex regulatory compliance (AU/NZ NSQHS, HIPAA, GDPR)
- Clinical safety-critical workflows
- Multi-jurisdictional requirements
- Evidence-based decision making
- Patient privacy and PHI protection

## Scope

### Implementation Tracks (14 total)

**Phase 1: Foundation**
- health-core: Plugin structure and standards ✓

**Phase 2: Core Workflows**
- health-coding: Clinical coding and classification ✓
- health-governance: Policies, procedures, guidelines ✓

**Phase 3: Extended Workflows**
- health-procurement: Device procurement, business cases ✓
- health-quality: QI, accreditation, PDSA cycles ✓
- health-financial: Payer contracts, charge capture ✓
- health-evidence: Systematic reviews, PRISMA workflows ✓
- health-data-analysis: Epidemiological reports ✓
- health-public-health: Notifiable diseases, surveillance ✓

**Phase 4: Research & Academic**
- health-ethics: Research/clinical ethics, REC/IRB ✓
- health-economics: HTA, cost-effectiveness, PBAC ✓
- health-manuscripts: Journal preparation, reporting guidelines ✓
- health-doc-coauthoring: Collaborative document development ✓
- health-grants: NHMRC, MRFF, HRC applications ✓
- health-medicolegal: Reports, child protection, affidavits ✓

**Infrastructure**
- skill-quality: Health skill templates and validation ✓

### Deliverables

| Component | Count | Description |
|-----------|-------|-------------|
| Skills | 34 | Healthcare domain expertise |
| Commands | 19 | Workflow initiation and guidance |
| Tracks | 14 | Development project management |
| Lines of Documentation | 12,000+ | Comprehensive guidance |

### Key Features

1. **Regulatory Compliance**
- AU/NZ-default (NSQHS, HQSC, PBAC, NHMRC)
- US/EU-lite portability (HIPAA, Joint Commission, GDPR)
- Jurisdiction matrices for all domains

2. **Clinical Safety**
- Confidence Indicators for risk assessment
- PHI/PII guardrails in all skills
- Standard and Lite operating modes

3. **Evidence Rigor**
- 14-section health skill standards
- Hybrid Evidence Management (strict citations + narrative)
- FHIR/SNOMED-CT alignment

4. **Quality Assurance**
- Automated track validation
- Health skill validation script
- Pre-commit hooks

## Implementation Details

### Skill Architecture
All skills follow standardized 14-section template:
- Purpose and scope
- Confidence Indicators table
- Security & Privacy (PHI/PII guardrails)
- Regulatory Context (jurisdiction matrix)
- Operating Modes (Standard/Lite)
- Detailed Guidance
- Common Mistakes (anti-patterns)
- Tool Requirements
- Success Indicators
- Cross-References

### Example Skills
- `systematic-review`: PRISMA 2020 compliance, GRADE grading
- `research-ethics`: NHMRC/HRC REC workflows, informed consent
- `hta-submission`: PBAC/MSAC/PHARMAC submission frameworks
- `notifiable-diseases`: AU/NZ notification requirements
- `child-protection`: Mandatory reporting triggers

### Commands
Interactive workflow commands including:
- `/start-review`: Systematic review protocol development
- `/ethics-review`: Research/clinical ethics routing
- `/report-notifiable`: Disease notification compliance
- `/prepare-manuscript`: Journal submission checklists
- `/grant-application`: NHMRC/MRFF structured applications

## Testing

- [x] All 14 tracks pass validation (`validate_tracks.py`)
- [x] Health skills pass quality checks (`validate_health_skills.py`)
- [x] Pre-commit hooks configured
- [x] GitHub Actions workflow for CI

## Future Work

Potential enhancements:
- Additional jurisdiction deep-dives (UK NICE, Canada CADTH)
- Integration with EHR connectors (Epic, Cerner)
- Mobile-responsive command interfaces
- Multi-language support for international deployment

## Documentation

- [conductor/index.md](conductor/index.md) - Project overview
- [conductor/tracks.md](conductor/tracks.md) - Track registry
- [conductor/tracks/health-plugin/](conductor/tracks/health-plugin/) - Standards and guidelines
- [health/README.md](health/README.md) - Plugin documentation

## Related

- Implements conductor development methodology
- Aligns with bio-research skills for evidence synthesis
- Complements legal plugin for contract review workflows
- Related to #18 (automated validation scripts)

## Checklist

- [x] All tracks complete
- [x] All skills follow health skill standards
- [x] AU/NZ jurisdiction defaults implemented
- [x] US/EU-lite portability included
- [x] Validation scripts passing
- [x] Documentation complete
- [x] Pre-commit hooks configured
- [x] GitHub Actions CI workflow