Read passive platform signals

Member-only, finite reads of daemon facts. No guest connection, wake, watcher, output read or Activity capture. An absent or empty since starts at the current head with baseline:true and no history. Replay uses the full opaque cursor; it advances past filtered rows. An expired, malformed, restarted or migrated epoch returns an explicit gap with a new head. These are ephemeral observations, not durable history, complete process coverage or task-success proof. Pages contain at most 100 events and 65536 encoded bytes. Query strings are at most 4096 characters; unknown or duplicate parameters are refused. Both emission scope and current daemon scope must match. Requests have finite routing/body deadlines and may fail unavailable; failures never become empty history. Responses are no-store.

Requires the member role or higher.