# C to B Promotion: Visual Guide

```mermaid
gantt
    title C→B Promotion Timeline (20-34 weeks)
    dateFormat  YYYY-MM-DD
    section Phase 1: Foundation
    Stability Baseline       :a1, 2024-01-01, 2w
    Testing Taxonomy Gap Analysis :a2, after a1, 1w
    Fuzzing Infrastructure    :a3, after a2, 2w
    Proven Programs Readiness :a4, after a3, 1w
    
    section Phase 2: Scaling
    User Expansion (10→50)  :b1, after a4, 4w
    Fuzzing Extension (7→30d) :b2, after a4, 6w
    Proven Programs (5→13)  :b3, after a4, 8w
    SBOM & Hypatia Integration :b4, after a4, 2w
    4-Nines Achievement      :b5, after b4, 2w
    
    section Phase 3: External
    Downstream Targets (6)   :c1, after b5, 4w
    Branch Protection        :c2, after b5, 1w
    External Audit           :c3, after c2, 3w
    User Validation (100)    :c4, after c3, 2w
    5-Nines Achievement       :c5, after c4, 1w
    
    section Phase 4: Finalization
    Integration Testing      :d1, after c5, 2w
    Documentation            :d2, after c5, 1w
    Demotion Dry-Run         :d3, after d2, 1w
    Preliminary Signoff      :d4, after d3, 1w
    Promotion Submission     :d5, after d4, 1w
```

## Subsystem Flowcharts

### Fuzzing Progression
```mermaid
flowchart TD
    A[7-day Baseline] --> B[14-day Validation]
    B --> C[21-day Structure-Aware]
    C --> D[30-day Full Coverage]
    D --> E[Continuous 90-day Maintenance]
    
    style A fill:#f9f,stroke:#333
    style B fill:#bbf,stroke:#333
    style C fill:#f96,stroke:#333
    style D fill:#6f9,stroke:#333
    style E fill:#9f6,stroke:#333
```

### Proven Programs Pipeline
```mermaid
flowchart TD
    P1[Program 1] --> V1[Prover A]
    P1 --> V2[Prover B]
    P2[Program 2] --> V3[Prover A]
    P2 --> V4[Prover C]
    P3[Program 3] --> V5[Prover B]
    P3 --> V6[Prover C]
    
    subgraph Batch 1
    P1 --> B1[Cross-Validation]
    P2 --> B1
    P3 --> B1
    end
    
    B1 --> P4
    B1 --> P5
    
    subgraph Batch 2
    P4 --> B2[Cross-Validation]
    P5 --> B2
    end
    
    style B1 fill:#f96
    style B2 fill:#f96
```

### Diversity Metrics Validation
```mermaid
flowchart TD
    subgraph Technical
    L1[Language Families ≥3] --> T[Technical Pass]
    L2[Runtime Environments ≥4] --> T
    L3[Architectures ≥2] --> T
    L4[OS Families ≥3] --> T
    end
    
    subgraph Organizational
    O1[Independent Orgs ≥4] --> O[Organizational Pass]
    O2[Geographic Regions ≥3] --> O
    O3[Industry Sectors ≥3] --> O
    end
    
    subgraph User
    U1[Roles ≥5] --> U[User Pass]
    U2[Expertise Levels ≥3] --> U
    U3[Use Cases ≥4] --> U
    end
    
    T --> DM[Diversity Metrics Pass]
    O --> DM
    U --> DM
    
    style DM fill:#9f9
```

## Versioning

**Document Version:** 1.0.0
**Last Updated:** 2026-04-15
**Status:** Active

### Version History

| Version | Date       | Changes | Author |
|---------|------------|---------|--------|
| 1.0.0   | 2026-04-15 | Initial creation with Mermaid diagrams and versioning section | Mistral Vibe |

### Change Control

1. **Minor Updates** (diagram improvements, typo fixes):
   - May be committed directly to main branch
   - Require PR review by at least one maintainer
   
2. **Major Updates** (structural changes, new subsystems):
   - Require RFC process
   - Must maintain backward compatibility
   - Require unanimous maintainer approval

### Compatibility

- **Mermaid Version:** Compatible with Mermaid.js 10.0+
- **Diagram Types:** gantt, flowchart
- **Rendering:** Tested with GitHub Markdown, VS Code Mermaid plugin

### Maintenance

- **Review Cycle:** Quarterly
- **Next Review:** 2026-07-15
- **Deprecation Policy:** 12 months notice for major changes

## Integration Notes

1. **CRG Alignment:** This guide complements CRG Grade B requirements
2. **K9 Automation:** See `automation-hooks` section for K9 integration points
3. **RSR Compliance:** All phases assume RSR-FULL (Gold) compliance
4. **Demotion Triggers:** Phase 4 includes demotion procedure validation