[Copilot]

If several Dev Proxy instances are running and --pid isn't given, devproxy logs picks one: the system-proxy instance if there is one, otherwise the most recently started. Until now it did this silently. This PR keeps the same choice but tells the user which instance it chose and how to pick another.

$ devproxy logs
Multiple Dev Proxy instances are running. Showing logs from PID 4888 (most recently started instance). Other instances: 4837. Use --pid to show logs from a specific instance.
 info    Dev Proxy (Kestrel engine) listening on 127.0.0.1:40753
 ...

Changes

• StateManager.SelectPrimaryState: the instance-selection ordering now lives in its own function. LoadStateAsync and LogsCommand both use it.
• LogsCommand: loads all running instances. When more than one is running, it prints the notice above to stderr, so piped or redirected log output is unchanged.
• Tests: DevProxy.Tests/LogsCommandTests.cs covers the single-instance case (no notice), the system-proxy choice, and the most-recently-started fallback.

For reviewers

This PR takes the issue's "at least" option: it reports the choice and doesn't make logs behave like stop/status. Requiring --pid when several instances are running would match those commands. It would also break scripts that call devproxy logs with no options. That can be a follow-up if we want it.

• Fixes devproxy logs silently picks one instance when multiple are running #1932

[Copilot]

🟢 Approval recommended

Selection behavior and stdout remain unchanged, and no blocking issues were identified.

No open issues 🎉

What changed in this PR

Addresses #1932 by making devproxy logs identify its selected instance without changing selection behavior or stdout log output.

Changes:

• Shares primary-instance selection through StateManager.SelectPrimaryState.
• Adds a stderr notice identifying the selected PID, other instances, and --pid.
• Adds selection/notice tests and updates dependency lock files.

File	Description
DevProxy/​State/​StateManager.cs	Extracts the existing instance-selection logic.
DevProxy/​packages.lock.json	Updates transitive dependency records.
DevProxy/​Commands/​LogsCommand.cs	Reports automatic instance selection to stderr.
DevProxy.Tests/​LogsCommandTests.cs	Covers notice suppression and both selection priorities.
DevProxy.Proxy.Kestrel/​packages.lock.json	Updates transitive dependency records.

_{Review effort: Balanced}

[waldekmastykarz]

@copilot build is failing, fix

[Copilot]

@copilot build is failing, fix

Fixed in f3adea1. The merged dependency updates left two NuGet lock files stale, causing NU1004 during CI restore. Updated those lock files; locked restore, the full solution build (zero warnings/errors), and all 16 DevProxy.Tests tests now pass locally.