Add REST GET /config endpoint to fetch agent configuration#1

Draft

Copilot wants to merge 7 commits intoget-configfrom

copilot/add-get-agent-config

Commits on Dec 8, 2025

Initial plan
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Add /config REST endpoint to fetch agent configuration

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Add test for /config endpoint

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Fix JSON serialization using nlohmann::json library for proper escaping

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Fix lambda capture and add static assertion for variant exhaustiveness

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Add explicit include and fix static assertion with template-dependent false

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Final implementation of /config endpoint

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