Add GitHub Copilot Agent Skills for DKNet Framework packages

[Copilot]

Provides AI-powered code generation guidance for teams consuming DKNet NuGet packages. Each skill encodes framework patterns, anti-patterns, and best practices to improve code quality and development velocity.

Skills Created

Core

• dknet-overview - Architecture, DDD patterns, Onion structure
• fw-extensions - String/type/collection utilities, validation helpers

EF Core

• efcore-abstractions - Base entities, audit trails, soft delete, domain events
• efcore-specifications - Specification pattern, dynamic predicates, LinqKit composition
• efcore-repos - Repository pattern, CQRS separation, Mapster projections

ASP.NET Core

• aspcore-idempotency - Idempotent operations, SQL Server storage, conflict handling

Messaging

• slimbus-messaging - Event-driven architecture, publish/subscribe patterns

Structure

Skills/
├── README.md                    # Installation options, learning path
└── {skill-name}/
    └── SKILL.md                 # YAML frontmatter + patterns + examples

Each skill (400-600 lines):

• 5+ usage patterns with complete examples
• Critical rules (e.g., .AsExpandable() required for LinqKit)
• Common mistakes with ❌/✅ comparisons
• Cross-references for navigation

Usage Example

// Copilot now suggests DKNet patterns automatically:

// Comment: Create a specification for active products with dynamic filters
public class ProductSearchSpec : Specification<Product>
{
    public ProductSearchSpec(string? searchTerm = null, decimal? minPrice = null)
    {
        var predicate = PredicateBuilder.New<Product>(p => !p.IsDeleted);
        
        if (!string.IsNullOrWhiteSpace(searchTerm))
        {
            predicate = predicate.DynamicAnd(builder => builder
                .With("Name", Ops.Contains, searchTerm));
        }
        
        WithFilter(predicate);
        AddOrderBy(p => p.Name);
    }
}

Installation

Repository-level: Automatic in DKNet repo
Global: cp -r Skills/* ~/.copilot/skills/
Per-project: Copy to .github/skills/

Coverage

• Total: 3,503 lines across 7 skills + master index
• Format: GitHub Copilot Agent Skill (YAML frontmatter + Markdown)
• Packages: All major DKNet packages (Core, EF Core, ASP.NET Core, Messaging)

Original prompt

Skills for copilot.

As I'm sharing this framework for my team to use my nuget packages for their applications development.

To improve the performance and quality of the code could you developers a set of DKNet skills and place them into Skills folder.

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.74%. Comparing base (0e6458b) to head (f50e7d6).
⚠️ Report is 4 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #276      +/-   ##
==========================================
+ Coverage   84.68%   84.74%   +0.05%     
==========================================
  Files         158      158              
  Lines        3585     3585              
  Branches      568      568              
==========================================
+ Hits         3036     3038       +2     
+ Misses        393      392       -1     
+ Partials      156      155       -1     

Flag	Coverage Δ
unittests	84.74% <ø> (+0.05%)	⬆️

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[github-actions]

📊 Code Coverage Report

| Metric | Coverage |
|--------|----------|
| **Line Coverage** | 87.9% |
| **Branch Coverage** | 82.4% |
| **Method Coverage** | 86.3% |

**Lines:** 3153/undefined covered
**Branches:** 1228/undefined covered

📈 [View Full Coverage Report](https://github.com/baoduy/DKNet/actions/runs/22048949187)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud