Kestrel: IConnectionListenerFactory

[benaadams]

Problem

The README states "Works as a custom transport for ASP.NET Core Kestrel" and lists Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions as a key dependency. No Kestrel integration exists.

Sub-tasks

• Create src/Magma.Kestrel project referencing Microsoft.AspNetCore.Server.Kestrel.Transport.Abstractions
• Implement IConnectionListenerFactory backed by Magma's TCP transport
• MagmaConnection wrapping Magma TCP connection as a Kestrel ConnectionContext
• Duplex pipe bridging Magma's packet flow to Kestrel's IDuplexPipe
• Unit tests with mock transport backend

Dependencies

Depends on: #108 (needs UDP for completeness), #103 (TCP must be tested first)
Unlocks: #132 (Kestrel backend selection)

Phase

Phase 3 (Advanced Integrations)

[copilot-swe-agent]

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