chore(main): release 0.4.0

[github-actions]

🤖 I have created a release beep boop

0.4.0 (2026-05-13)

Features

• add generic HttpConnectionStageLogic<TSM> base stage (4901d10)
• add pipeline tracing across all BidiStages and stage logic (3d31bbe)
• add RequestFault helper for shared request error handling (5c7f491)
• bench: add microbenchmark project with baseline comparisons (3d5a6b0)
• define IHttpStateMachine interface and expand IStageOperations (6876159)
• h11: implement IHttpStateMachine on Http11 StateMachine (5420762)
• lifecycle: add ConsumerActor for per-consumer ingress and response sink (b135cd3)
• tests: configure xunit parallelization and timeouts (143003f)
• tests: Migrate integration tests to new structure (f981f7a)

Bug Fixes

• add exception safety to all pipeline onPush handlers (7e481e4)
• fix namespace errors (bc5d0f9)
• h11: handle reconnect failure gracefully instead of failing stage (dc6066a)
• h11: use OnComplete for reconnect exhaustion instead of OnFail (eafefdd)
• obsolete ctor (acffe6c)

Documentation

• add eager pipeline materialization spec and plan (a77a1f4)
• add StreamTests consolidation and microbenchmark plans (6cbcf00)

Dependencies

• Bump Testcontainers from 4.6.0 to 4.11.0 (9d7d0ea)
• Bump Verify.XunitV3 from 31.16.1 to 31.16.3 (6bfe8bd)

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