Fix formatting in task-planner.agent.md

[hunterhogan]

Without the space before the comma, VS Code interpreted the comma as part of the file name, which caused the following error even though the target file was in the target location:

File './task-researcher.agent.md,' not found at 'C:\Users\hunte\AppData\Roaming\Code - Insiders\User\prompts\task-researcher.agent.md,'.

After adding the space, the yellow squiggles and error went away.

Pull Request Checklist

• [ ] I have read and followed the CONTRIBUTING.md guidelines.
• [ ] My contribution adds a new instruction, prompt, or chat mode file in the correct directory.
• [ ] The file follows the required naming convention.
• [ ] The content is clearly structured and follows the example format.
• [ ] I have tested my instructions, prompt, or chat mode with GitHub Copilot.
• [ ] I have run npm start and verified that README.md is up to date.

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Description

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Type of Contribution

• [ ] New instruction file.
• [ ] New prompt file.
• [ ] New chat mode file.
• [ ] New collection file.
• [ ] New skill file.
• [ ] Update to existing instruction, prompt, chat mode, collection or skill.
• [ ] Other (please specify):

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Additional Notes

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.