Fix New-IdlePlan example in plan-export.md documentation

[Copilot]

Summary

Corrects the New-IdlePlan example in plan export documentation to match actual cmdlet signature.

Motivation

The example used invalid parameters (-IdentityId) and wrong file type (.json instead of .psd1), which would fail if executed.

Type of Change

• Documentation update

Changes

• Changed workflow file extension from .json to .psd1
• Added New-IdleLifecycleRequest call to create required request object
• Removed non-existent -IdentityId parameter
• Updated to use correct -Request parameter

Before:

$plan = New-IdlePlan -WorkflowPath './workflows/joiner.json' -IdentityId 'jdoe'

After:

$request = New-IdleLifecycleRequest -LifecycleEvent 'Joiner' -IdentityKeys @{ EmployeeId = 'jdoe' }
$plan = New-IdlePlan -WorkflowPath './workflows/joiner.psd1' -Request $request

Testing

• Manual testing

How to test & review

Verify the example matches the cmdlet signature in src/IdLE/Public/New-IdlePlan.ps1 and follows the pattern from docs/use/quickstart.md.

Checklist

• Code follows STYLEGUIDE.md
• Tests added or updated
• Documentation updated
• No UI/auth logic added to IdLE.Core
• No breaking changes without discussion

Related Issues

Addresses feedback from PR #121 review comment.

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