fix(scripts): add correct path for copilot-instructions.md

[arampp-xitaso]

Description

• copilot-instructions.md was located in the wrong directory
• fixes copilot-instructions.md created in the wrong folder #1254

Testing

• Tested locally with uv run specify --help
• Ran existing tests with uv sync && uv run pytest
• Tested with a sample project (if applicable)

AI Disclosure

• I did not use AI assistance for this contribution
• I did use AI assistance (describe below)

[Copilot]

Pull request overview

Updates the agent-context update scripts so GitHub Copilot instructions are written to the correct repository location (.github/copilot-instructions.md), aligning with expected GitHub Copilot configuration and fixing issue #1254.

Changes:

• Adjust Copilot instructions output path in the PowerShell updater script.
• Adjust Copilot instructions output path in the Bash updater script.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
scripts/powershell/update-agent-context.ps1	Writes Copilot instructions to .github/copilot-instructions.md instead of .github/agents/....
scripts/bash/update-agent-context.sh	Writes Copilot instructions to .github/copilot-instructions.md instead of .github/agents/....

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