fix(skills): remove phantom resource references and fix CoC links (#447)

Remove references to non-existent resource files (references/, assets/,
scripts/, examples/) from 115 skill SKILL.md files. These sections
pointed to directories and files that were never created, causing
confusion when users install skills.

Also fix broken Code of Conduct links in issue templates to use
absolute GitHub URLs instead of relative paths that 404.

plugins/backend-development/skills/api-design-principles/SKILL.md

@@ -516,13 +516,3 @@ def create_context():
 - **Poor Documentation**: Undocumented APIs frustrate developers
 - **Ignoring HTTP Semantics**: POST for idempotent operations breaks expectations
 - **Tight Coupling**: API structure shouldn't mirror database schema
-
-## Resources
-
-- **references/rest-best-practices.md**: Comprehensive REST API design guide
-- **references/graphql-schema-design.md**: GraphQL schema patterns and anti-patterns
-- **references/api-versioning-strategies.md**: Versioning approaches and migration paths
-- **assets/rest-api-template.py**: FastAPI REST API template
-- **assets/graphql-schema-template.graphql**: Complete GraphQL schema example
-- **assets/api-design-checklist.md**: Pre-implementation review checklist
-- **scripts/openapi-generator.py**: Generate OpenAPI specs from code

plugins/backend-development/skills/architecture-patterns/SKILL.md

@@ -464,31 +464,3 @@ class OrderRepository:
         await self._publish_events(order._events)
         order._events.clear()
 ```
-
-## Resources
-
-- **references/clean-architecture-guide.md**: Detailed layer breakdown
-- **references/hexagonal-architecture-guide.md**: Ports and adapters patterns
-- **references/ddd-tactical-patterns.md**: Entities, value objects, aggregates
-- **assets/clean-architecture-template/**: Complete project structure
-- **assets/ddd-examples/**: Domain modeling examples
-
-## Best Practices
-
-1. **Dependency Rule**: Dependencies always point inward
-2. **Interface Segregation**: Small, focused interfaces
-3. **Business Logic in Domain**: Keep frameworks out of core
-4. **Test Independence**: Core testable without infrastructure
-5. **Bounded Contexts**: Clear domain boundaries
-6. **Ubiquitous Language**: Consistent terminology
-7. **Thin Controllers**: Delegate to use cases
-8. **Rich Domain Models**: Behavior with data
-
-## Common Pitfalls
-
-- **Anemic Domain**: Entities with only data, no behavior
-- **Framework Coupling**: Business logic depends on frameworks
-- **Fat Controllers**: Business logic in controllers
-- **Repository Leakage**: Exposing ORM objects
-- **Missing Abstractions**: Concrete dependencies in core
-- **Over-Engineering**: Clean architecture for simple CRUD

plugins/backend-development/skills/cqrs-implementation/SKILL.md

@@ -547,8 +547,3 @@ class ConsistentQueryHandler:
 - **Don't couple read/write schemas** - Independent evolution
 - **Don't over-engineer** - Start simple
 - **Don't ignore consistency SLAs** - Define acceptable lag
-
-## Resources
-
-- [CQRS Pattern](https://martinfowler.com/bliki/CQRS.html)
-- [Microsoft CQRS Guidance](https://docs.microsoft.com/en-us/azure/architecture/patterns/cqrs)

plugins/backend-development/skills/event-store-design/SKILL.md

@@ -429,9 +429,3 @@ Capacity: On-demand or provisioned based on throughput needs
 - **Don't store large payloads** - Keep events small
 - **Don't skip optimistic concurrency** - Prevents data corruption
 - **Don't ignore backpressure** - Handle slow consumers
-
-## Resources
-
-- [EventStoreDB](https://www.eventstore.com/)
-- [Marten Events](https://martendb.io/events/)
-- [Event Sourcing Pattern](https://docs.microsoft.com/en-us/azure/architecture/patterns/event-sourcing)

plugins/backend-development/skills/microservices-patterns/SKILL.md

@@ -562,34 +562,3 @@ async def call_payment_service(payment_data: dict):
         payment_data
     )
 ```
-
-## Resources
-
-- **references/service-decomposition-guide.md**: Breaking down monoliths
-- **references/communication-patterns.md**: Sync vs async patterns
-- **references/saga-implementation.md**: Distributed transactions
-- **assets/circuit-breaker.py**: Production circuit breaker
-- **assets/event-bus-template.py**: Kafka event bus implementation
-- **assets/api-gateway-template.py**: Complete API gateway
-
-## Best Practices
-
-1. **Service Boundaries**: Align with business capabilities
-2. **Database Per Service**: No shared databases
-3. **API Contracts**: Versioned, backward compatible
-4. **Async When Possible**: Events over direct calls
-5. **Circuit Breakers**: Fail fast on service failures
-6. **Distributed Tracing**: Track requests across services
-7. **Service Registry**: Dynamic service discovery
-8. **Health Checks**: Liveness and readiness probes
-
-## Common Pitfalls
-
-- **Distributed Monolith**: Tightly coupled services
-- **Chatty Services**: Too many inter-service calls
-- **Shared Databases**: Tight coupling through data
-- **No Circuit Breakers**: Cascade failures
-- **Synchronous Everything**: Tight coupling, poor resilience
-- **Premature Microservices**: Starting with microservices
-- **Ignoring Network Failures**: Assuming reliable network
-- **No Compensation Logic**: Can't undo failed transactions

plugins/backend-development/skills/projection-patterns/SKILL.md

@@ -483,8 +483,3 @@ class CustomerActivityProjection(Projection):
 - **Don't skip error handling** - Log and alert on failures
 - **Don't ignore ordering** - Events must be processed in order
 - **Don't over-normalize** - Denormalize for query patterns
-
-## Resources
-
-- [CQRS Pattern](https://docs.microsoft.com/en-us/azure/architecture/patterns/cqrs)
-- [Projection Building Blocks](https://zimarev.com/blog/event-sourcing/projections/)

plugins/backend-development/skills/saga-orchestration/SKILL.md

@@ -477,8 +477,3 @@ class TimeoutSagaOrchestrator(SagaOrchestrator):
 - **Don't skip compensation testing** - Most critical part
 - **Don't couple services** - Use async messaging
 - **Don't ignore partial failures** - Handle gracefully
-
-## Resources
-
-- [Saga Pattern](https://microservices.io/patterns/data/saga.html)
-- [Designing Data-Intensive Applications](https://dataintensive.net/)