Release v1.2.1

Changed

• Config mode logs each route's internal name at start, as
  Route 'orders_cdc' runs as 'ui_collector_route_<hex>'. Defaults named after the route
  (the dedup and aggregate stores, the MQTT client id, ...) use that internal name; the CLI
  reference now lists them.

Fixed

• Kafka delayed_ack: true could lose messages. Sends were acked before the broker
  confirmed them, and a failed delivery was dropped silently. A route now holds the source's
  commits until the publisher's flush has seen every delivery report (about every 100 ms); a
  failed or unconfirmed delivery fails the flush and the source redelivers. Sends still
  return without waiting for the broker.
• MongoDB consume: delete drain could end before a crashed run's documents came back.
  Documents a killed process had claimed stay locked for their 60 s lease, and a drain
  started in that window read the collection as empty and exited, leaving them behind. A
  draining consumer now waits for those claims to lapse, at most the lease plus 2 s.
• A second mqb instance failed to start on the implicit metrics port. When nothing set
  metrics_addr and 127.0.0.1:9090 was taken, the start failed. The bridge now logs a
  warning and runs without the Prometheus endpoint; an address set in the config or with
  --metrics-addr must still be free.
• A plugin URI set url on endpoints that have no url field. When a plugin's schema
  positioned no field, the URI up to the query was always written to url. That now happens
  only if the schema declares no properties or declares url itself.
• mqb list and mqb describe showed a generic URI for plugin endpoints. They printed
  <scheme>://<address>?<param>=<value> whatever the plugin's schema mapped. They now show
  the shape it reads, such as rp://<url>/<topic>?<param>=<value>.

Pull requests

• Update docs by @marcomq in #172
• Add MQB to name by @marcomq in #179

Full Changelog: v1.2.0...v1.2.1