Add capability-gated surface methods across the bot packages so one handler
degrades gracefully per platform:
- thread.react / thread.unreact — emoji reactions (Slack, Discord, Telegram)
- thread.postEphemeral — only-you messages with a required DM fallback
- openModal (interaction/command-scoped) — structured forms (Slack rich,
Discord text-only), omitted on surfaces with no live interaction trigger
Spans @copilotkit/bot-ui, bot, bot-slack, bot-discord, bot-telegram with
per-adapter capability flags. Discord: open modals from slash-command
interactions, and never clear registered commands on an empty publish.
Tyler Slaton