Wrap $PSProcessPath automatic variable in PSProcessPathAutomaticVariable experimental feature

[Copilot]

$PSProcessPath was unconditionally registered as an automatic variable in every session. This wraps it behind the PSProcessPathAutomaticVariable engine experimental feature so it can be opted into rather than always present.

Changes

• ExperimentalFeature.cs: Added PSProcessPathAutomaticVariable constant and corresponding EngineExperimentalFeatures entry
• SessionState.cs: Gated $PSProcessPath variable registration behind ExperimentalFeature.IsEnabled(ExperimentalFeature.PSProcessPathAutomaticVariable)
• AutomaticVariables.Tests.ps1: Updated existing tests to skip via Set-ItResult -Skipped when the feature is disabled; added a complementary "feature disabled" describe block that asserts the variable is absent

Behavior

# Feature disabled (default) — variable not registered
Get-Variable PSProcessPath   # throws

# Feature enabled
Enable-ExperimentalFeature PSProcessPathAutomaticVariable
# restart session
$PSProcessPath   # /usr/bin/pwsh (constant, AllScope)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Wrap</issue_title>
<issue_description>### Summary of the new feature / enhancement

Wrap the Automatic Variable for PSProcessPath in an experimental feature

Proposed technical implementation details (optional)

Wrap the changes in branch copilot/add-automatic-variable-current-process-path in an experimental feature</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Wrap Automatic Variable implementaion for PSProcessPath in an experimental feature #166

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[kilasuit]

@copilot can we rename the Experimental Feature to PSProcessPathAutomaticVariable

[Copilot]

@copilot can we rename the Experimental Feature to PSProcessPathAutomaticVariable

Done — renamed to PSProcessPathAutomaticVariable across ExperimentalFeature.cs, SessionState.cs, and the test file in commit 066928f.

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