The Buzz adapter's check_requirements() reads config from env only, so a
config.yaml-only setup (relay URL in gateway.platforms.buzz.extra) failed the
check_fn gate and was silently skipped at startup. Add an apply_yaml_config_fn
hook that bridges buzz.extra -> BUZZ_* env vars, mirroring the Slack/Telegram
pattern; BUZZ_PRIVATE_KEY stays a .env secret.
Also fix send_reaction() to use buzz-cli's real flags (--event <id> --emoji),
replacing the non-existent --channel/--message-id flags that would have failed
on every message. Verified live against the hosted relay (accepted:true).
Refs #68871
Plugin-path adapter (zero core changes) connecting Hermes to a Buzz
community relay via the buzz CLI binary (JSON in/out, arg-list exec,
key passed via env only). Inbound uses a poll loop with per-channel
high-water marks seeded from newest (no history replay), event-id
de-dupe, self-echo suppression by pubkey, and mention gating in
channels (DMs always dispatch). Registers env_enablement, cron
home-channel delivery, and an out-of-process standalone sender,
mirroring the IRC plugin.
Verified against a live relay: connect -> send -> poll -> MessageEvent
round-trip, self-echo suppressed, clean disconnect.
Known limitation: polled inbound (default 4s); a websocket transport
(buzz-ws-client) is a future optimization.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
