fix passive-voice vale errors in docs + hive-otel module-eval test for the new journald receiver

docs/scheduler/observability.md

@@ -327,17 +327,15 @@ Cadence follows `metricIntervalMs` (default 60s). Transport is OTLP/HTTP
 first hop is unauthenticated for every producer on this host, and the upstream
 credential stays on the swarm tier.
 
-<!-- vale write-good.Passive = YES -->
-
 ## Container-crash alerting (hive-c0re)
 
 The crash watcher (`crash_watch.rs`, a 10s poll of every managed container)
 classifies a container that stopped without an operator-initiated action as
 a crash and `tracing::warn!`s `"container crash detected"` — nothing else:
 no broker event, no per-hive dashboard banner. Both of those used to exist;
-they were removed in favour of this.
+this change removed them in favour of the log line.
 
-When `otel.enable` is set, the hive tier's own collector runs a `journald`
+When `otel.enable` is on, the hive tier's own collector runs a `journald`
 receiver scoped to `hive-c0re.service` (no bind mount needed — unlike an
 agent's journal, this collector already shares a filesystem with the unit it
 reads, being a host systemd service rather than a container) and forwards
@@ -351,8 +349,9 @@ Requires `services.journald.storage = "persistent"` (the NixOS default) on
 every hive host with `otel.enable` set — asserted at eval time.
 
 ⚠️ **A hive with `otel.enable` off has no operator-visible crash signal at
-all** — the per-hive dashboard banner this replaces is gone, and there is no
-fallback path. Turning on `otel.enable` is what makes a crash reach anyone.
+all** — the per-hive dashboard banner this replaces no longer exists, and
+there is no fallback path. Turning on `otel.enable` is what makes a crash
+reach anyone.
 
 ## Agent-emitted per-turn metrics (`hive-agent`)