[IBuildEngine callbacks] Stage 1: Packet infrastructure + IsRunningMultipleNodes#13149

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JanProvaznik merged 35 commits intodotnet:mainfrom

JanProvaznik:ibuildengine-callbacks-stage1

Feb 24, 2026

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Add .NET Core TaskHost E2E test for callback support
JanProvaznik
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Commits on Feb 23, 2026

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Update documentation/specs/multithreading/taskhost-threading.md

JanProvaznik
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rainersigwald
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Simplify callback wait: replace polling with fail-on-disconnect

JanProvaznik
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Copilot
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Use plain string for connection-lost exception (not a user-facing message)

JanProvaznik
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Copilot
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Replace 'parent' terminology with 'owning worker node' per review

JanProvaznik
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Copilot
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Remove accidentally committed session state
JanProvaznik
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Document TaskHost lifecycle: task reuse, state, and shutdown

JanProvaznik
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Copilot
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Fix docs: task object cache is disposed per build, not per process

JanProvaznik
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Copilot
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Call out cancellation-aware callbacks as future opportunity

JanProvaznik
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Copilot
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Split packet serialization tests into separate class

JanProvaznik
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Copilot
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Clarify IsRunningMultipleNodes is config-based, not runtime

JanProvaznik
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Copilot
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Fix fallback test: assert MSB5022 error via logger, not OverallResult

JanProvaznik
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Copilot
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Cross-reference duplicate test tasks with explanatory comments

JanProvaznik
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Copilot
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Deduplicate test task: link IsRunningMultipleNodesTask into ExampleTask

JanProvaznik
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Copilot
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E2E test: target TestTask directly, skip restore

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Copilot
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Use InternalErrorException for unknown query type

JanProvaznik
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Copilot
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Fix TaskHostLifecycle test: restore ExampleTask copy to output

JanProvaznik
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Copilot
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Commits on Feb 24, 2026