Add 11 end-to-end sample projects

[jeremydmiller]

Summary

• Adds `samples/` directory with 11 self-contained Bobcat spec projects, each demonstrating a different application pattern
• Every sample is both the application (in-memory ASP.NET Core minimal API) and the test runner (Bobcat + Alba)
• Two samples demonstrate Wolverine message-bus integration (OutboxDemo, ProjectManagement)
• All 101 scenarios pass across the full suite
• All 11 projects added to `bobcat.sln`

Samples

Project	Scenarios	Pattern
CqrsMinimalApi	5	CQRS client CRUD via minimal API
CleanArchitectureTodos	10	Todo management with layered design
BankAccountES	9	Event-sourced bank account
EcommerceMicroservices	8	Product catalog microservice
OutboxDemo	4	Wolverine message dispatch (in-memory)
MoreSpeakers	10	Conference speaker + session management
BookingMonolith	15	Hotel room booking system
EcommerceModularMonolith	19	Products + customers + orders
MeetingGroupMonolith	10	Groups, events, attendance
PaymentsMonolith	10	Account transfers and refunds
ProjectManagement	1	Wolverine tracking + HTTP verification

Architecture pattern (per sample)

```
Program.cs — BobcatRunner.Run entry point, registers AlbaResource
AppBootstrap.cs — WebApplicationBuilder services + minimal API routes
Fixture.cs — Bobcat Fixture with [Given]/[When]/[Then] steps
Features/.feature — Gherkin scenarios
*.csproj — refs Bobcat, Bobcat.Alba, Bobcat.Generators
```

Test plan

• `dotnet build bobcat.sln` — succeeds (19 projects)
• All 11 samples pass: 101/101 scenarios

🤖 Generated with Claude Code