Implement auto-relaunch on process crash

[tmat]

When a process crashes (i.e. terminates with non-zero exit code) any change to the source files of the project or any of its dependencies will trigger relaunching of the project. If a project is launched multiple times and multiple processes crash each crashed one is relaunched after the file change.

[tmat]

@DustinCampbell ptal

[Copilot]

Pull request overview

Adds auto-relaunch behavior to dotnet watch Hot Reload so that peripheral projects that crash (non-zero exit) are relaunched after a subsequent relevant file change, and includes a regression test for the scenario.

Changes:

• Track crashed peripheral project instances and queue relaunch operations to be executed on subsequent file changes.
• Integrate relaunch execution into the Hot Reload update/apply loop.
• Add a new test validating relaunch-on-crash behavior.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
test/dotnet-watch.Tests/HotReload/RuntimeProcessLauncherTests.cs	Adds a new test that crashes a service process and asserts it is relaunched after a file change.
src/Dotnet.Watch/dotnet-watch/Properties/launchSettings.json	Modifies the debug working directory setting for the dotnet-watch launch profile.
src/Dotnet.Watch/Watch/Utilities/ImmutableDictionaryExtensions.cs	Adds helper extensions for ImmutableDictionary<TKey, ImmutableArray<TValue>> to simplify add/remove and iteration.
src/Dotnet.Watch/Watch/UI/IReporter.cs	Introduces new message descriptors for relaunch lifecycle and crash notification.
src/Dotnet.Watch/Watch/Process/RunningProject.cs	Adds a relaunch-flavored restart operation wrapper with dedicated logging.
src/Dotnet.Watch/Watch/HotReload/HotReloadDotNetWatcher.cs	Wires relaunch behavior into the main watch loop and adjusts file-change waiting behavior for unhandled exceptions.
src/Dotnet.Watch/Watch/HotReload/CompilationHandler.cs	Implements relaunch operation tracking, scheduling, and triggering based on changed files/project graph.