fix(ConditionGroupTransformAttribute): Transform calls [ConditionGroup]::FromJson() which doesn't exist

[HeyItsGilbert]

Summary

ConditionGroupTransformAttribute.Transform attempts to call [ConditionGroup]::FromJson($json) when the input is a string file path. ConditionGroup has no FromJson static method — FeatureFlag and PropertySet both have one, but ConditionGroup was never given one. Any string passed through this transform attribute throws MethodNotFound.

File

Gatekeeper/Classes/FeatureFlag.ps1:234

Reproduction

# Test-Condition has [ConditionGroupTransformAttribute()] on -Condition
Test-Condition -Context $ctx -PropertySet $props -Condition '.\mycondition.json'
# Throws: Method invocation failed because [ConditionGroup] does not contain a
#         static method named 'FromJson'

Fix Options

Option A — Add the missing method to ConditionGroup:

static [ConditionGroup] FromJson([string]$json) {
    $data = ConvertFrom-JsonToHashtable -InputObject $json
    return [ConditionGroup]::new($data)
}

Option B — Remove the string/file-path branch from the transform attribute if loading conditions from standalone files is not a supported use case.

Notes

• Good first issue
• Found by Jordan B., Sage Nakamura, Chip Torres, Shawn Wee!-ler, and Glenn