Samples: Request-prep Work Graph

[Skymly]

Relates to: Skymly/DesignPatterns#308

Blocked by:

• Runtime: Work Graph builder + wave execution DesignPatterns#309
• SourceGenerators: Work Graph Keys + Create facade + Verify DesignPatterns#311

Parent

Skymly/DesignPatterns#308

What to build

A runnable request-prep sample in DesignPatterns.Samples that exercises the shipped Fork–Join Work Graph APIs: Auth ∥ LoadConfig → BuildPrincipal → Authorize (multi-root then join). Demonstrates shared TContext mutation, attribute and/or generated Create path as appropriate once library APIs are consumable. Satisfies ROADMAP F3 admission criterion #3 for this domain.

Acceptance criteria

• Sample project builds and runs against a consumable Work Graph package/API from DesignPatterns
• Graph shape matches Spec sketch: Auth and LoadConfig in parallel, then BuildPrincipal, then Authorize
• Sample is discoverable from the Samples repo structure/README conventions
• Does not implement library Runtime/generator changes in this repo

Blocked by

• Runtime: Work Graph builder + wave execution DesignPatterns#309
• SourceGenerators: Work Graph Keys + Create facade + Verify DesignPatterns#311