Add unit tests for Invoke-PSClaudeCode

[Copilot]

Adds Pester test suite for Invoke-PSClaudeCode, the module's main function.

Test Coverage (27 tests)

• Parameters: Task, Model, dangerouslySkipPermissions validation
• Tools: Read-File, Write-File, Run-Command, Delegate-Task schema verification
• Internal functions: Execute-Tool, Check-Permission, Run-SubAgent behavior
• API integration: Anthropic endpoint, headers, response processing
• Module exports: Command availability and ipcc alias

Implementation

Tests validate function structure and configuration via pattern matching on source code, avoiding live API calls. Function content cached in BeforeAll to eliminate duplication across test contexts.

# Run tests
Invoke-Pester -Path ./Tests/Invoke-PSClaudeCode.Tests.ps1

# Result: 27/27 passing

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add unit tests</issue_title>
<issue_description>Add unit tests only for Invoke-PSClaudeCodeAgent in PSClaudeCode.psm1</issue_description>

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

• Fixes Add unit tests #2

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