Server- and client-side infrastructure other subsystems (humanoid,
analytics, project surfaces) can log into: an open-category Logger
contract, per-session WS forwarding gated by DEBUG_ACCESS_KEY in prod
(frictionless in dev), and a production-shippable DebugPanel.svelte.
Also logs full conversation content (system prompt, user/assistant
messages) under its own `messages` category so a session's history is
trackable while debugging, with DEBUG_LOG_MESSAGES to keep that content
out of the unconditional console/stdout mirror when desired.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>