address #1351 - waitfor between script and runspace not respected

[oising]

**Closes #1351 **

PR Checklist

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• PR doesn't include merge commits (always rebase on top of our main, if needed)
• New integration
  • Docs are written
  • Added description of major feature to project description for NuGet package (4000 total character limit, so don't push entire description over that)
• Tests for the changes have been added (for bug fixes / features) (if applicable)
• Contains NO breaking changes
• Every new API (including internal ones) has full XML docs
• Code follows all style conventions

Other information

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/CommunityToolkit/Aspire/main/eng/scripts/dogfood-pr.sh | bash -s -- 1352

Or

• Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/CommunityToolkit/Aspire/main/eng/scripts/dogfood-pr.ps1) } 1352"

[Copilot]

Pull request overview

Fixes the PowerShell hosting integration’s WaitFor(...) behavior regression (reported in #1351) by aligning resource lifecycle/eventing with Aspire 13.2+ expectations (publishing a Starting state before BeforeResourceStartedEvent so dependencies can block correctly).

Changes:

• Publish KnownResourceStates.Starting for runspace pool and script resources during initialization to ensure WaitFor(...) is respected.
• Avoid duplicate/initial-state notifications by skipping NotStarted (and for the pool, Starting) state publications from subsequent runtime state-change handlers.
• Update the examples PowerShell AppHost with an aspire.config.json entry.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/CommunityToolkit.Aspire.Hosting.PowerShell/PowerShellScriptResource.cs	Skips publishing state updates for the initial NotStarted state; disposes _cts without nullable check.
src/CommunityToolkit.Aspire.Hosting.PowerShell/PowerShellRunspacePoolResourceBuilderExtensions.cs	Publishes Starting before BeforeResourceStartedEvent for scripts; adjusts how script startup is invoked.
src/CommunityToolkit.Aspire.Hosting.PowerShell/PowerShellRunspacePoolResource.cs	Skips publishing NotStarted/Starting updates from pool state-change events (relies on initializer for Starting).
src/CommunityToolkit.Aspire.Hosting.PowerShell/DistributedApplicationBuilderExtensions.cs	Publishes Starting before BeforeResourceStartedEvent for the runspace pool; awaits pool start.
examples/powershell/CommunityToolkit.Aspire.PowerShell.AppHost/aspire.config.json	Adds Aspire app host config pointing to the AppHost project.

[aaronpowell]

Only a minor nit then it'd be fine to merge.

[aaronpowell]

let's drop this file, as it can cause a pain with the wider tooling (we need to figure out a better way to handle this though)