Add startup configuration banner, /config endpoint, and structured validation errors#3

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copilot/add-startup-banner-and-config-endpoint

Commits on Dec 23, 2025

Initial plan
Copilot
committed
Add startup banner, /config endpoint, validation error handling, and Makefile

Copilot
and
kngms
committed
Address code review feedback - fix unused parameter and clarify initialization order

Copilot
and
kngms
committed