Client unregister client_id fix
POST /api/v1/client/unregister now accepts client_id from request body.
Status: shipped | Area: policy | Published: 2026-03-20
Control impact: Fixes client count tracking.
POST /api/v1/client/unregister now accepts client_id from the JSON request body as a fallback when the X-Client-ID header is absent.
Previously, API clients that passed the ID in the body were silently ignored and the client count was never decremented.