Compose/fix-up on top of the cherry-picked cluster commits:
- Unify the config surface: platforms.buzz.reply_to_mode: off (PlatformConfig
field, as Discord/Telegram) and extra.reply_in_thread: false (the key Slack
users know; env BUZZ_REPLY_IN_THREAD) are equivalent opt-outs, bridged
through _apply_yaml_config and honored by send(), send_image(), and
_standalone_send (cron delivery).
- Progress/status bubbles honor the opt-out too: gateway/run.py resolves
_progress_reply_in_thread from the Buzz adapter (mirroring the Slack path)
so the synthetic-thread fallback and the progress reply anchor are both
suppressed when the user asked for flat replies (#75082, #95842).
- Deduplicate NIP-10 parsing: inbound session thread_id now reuses
_extract_thread_root (marked root > reply > legacy positional e-tag)
instead of a second inline root-marker-only scan.
- display_config: add buzz to _PLATFORM_DEFAULTS at TIER_MEDIUM — with
edit_message now implemented, accumulate-style progress works, but without
the entry Buzz inherited the verbose _GLOBAL_DEFAULTS and every interim
update became a permanent channel post (#95841).
- plugin.yaml optional_env + platform docs for the new keys.
- contributors/emails mappings for the cherry-picked authors.
Teknium