Implements a Buzz channel backed by a Nostr relay:
- kind:9 events scoped by "h" tag, "p" tags for mentions
- NIP-42 (kind:22242) auth before subscription
- optional threaded replies via "e" tag
- registered as config.ChannelBuzz with BuzzSettings
Expose a public registration hook so external packages that register a channel
factory via channels.RegisterFactory can also register the channel's settings
struct prototype. Without this, InitChannelList rejects any channel type absent
from the private channelSettingsFactory map, making out-of-tree channels
impossible without forking. The map access is now guarded by a RWMutex.
This is additive and changes no existing behavior.
* Support streaming
* fix: stream pico reasoning updates
Route Pico reasoning through the active streamer and hide empty thought placeholders.
* fix: harden configured streaming delivery
* fix ci
* fix split issue
