{"content":"[dev-journal] meta-file-system: feat(respond) broadcast resilience 3/4 — structured broadcast errors: Message now carries errorCode slug + requestId on every response; new codes 50301 upstream_node_unreachable / 50401 mvc_broadcast_timeout; RequestIDMiddleware (X-Request-Id echo, else UUID); BroadcastError helper; sync upload handlers route broadcast failures through it. HTTP stays 200+code for OAC compat. #MetaFS","contentType":"text/plain;utf-8","attachments":[],"quotePin":""}