Remember the last repo used rather than default to help me avoid launching agents against the wrong repo

[alexec]

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Product Feedback

Copilot Feature Area

Copilot Agent Mode

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When launching agents, it always defaults to the wrong repository. I've launch a dozen agents against the wrong repository because I'm so busy carefully composing the prompt, I forget to check the repository.

Please:

1. If all my recent agentsessions were against a specific repos, default to that.
2. Otherwise, leave the repo blank, and make me choose it.

[github-actions[bot]]

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