Add scenario setup and teardown lifecycle

[slideep]

Summary

• add scenario setup and teardown lifecycle sections around existing steps
• emit/report lifecycle phase for setup, main, and teardown steps
• run teardown after setup/main failures while preserving the first failure as authoritative
• make scenario discovery/action filtering and validation lifecycle-aware

Validation

• dotnet test Luotsi.Cli.Tests\Luotsi.Cli.Tests.csproj
• dotnet build -c Release
• git diff --check

[Copilot]

Pull request overview

Adds scenario lifecycle support (setup / main steps / teardown) to the Luotsi scenario runner, including phase-aware reporting/events and ensuring teardown runs even after setup/main failures.

Changes:

• Introduces setup and teardown sections in ScenarioFile and makes validation/catalog discovery lifecycle-aware.
• Executes scenario lifecycle with phase reporting in JSONL events and scenario reports.
• Extends test fakes and adds coverage for lifecycle ordering, phase reporting, and “first failure wins” behavior.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
Luotsi.Cli/Scenarios/ScenarioValidator.cs	Validates setup/main/teardown steps in order; updates “observe from previous step” rule to be lifecycle-aware.
Luotsi.Cli/Scenarios/ScenarioExecutor.cs	Runs setup + main with teardown always attempted; emits per-step phase and reports phase in step results.
Luotsi.Cli/Scenarios/ScenarioEvents.cs	Extends scenario event payload with phase field.
Luotsi.Cli/Scenarios/ScenarioCatalog.cs	Includes lifecycle steps in catalog action discovery and step counting; adds ScenarioStepPhases.
Luotsi.Cli/Models/Contracts.cs	Extends ScenarioFile contract to include Setup and Teardown.
Luotsi.Cli.Tests/TestSupport.cs	Enhances FakeDeviceHost to support lifecycle-related assertions and injected failures.
Luotsi.Cli.Tests/ScenarioExecutorTests.cs	Adds tests for lifecycle ordering, validation, teardown-after-failure, and phase reporting.