Buttons are semantic options, not a separate channel protocol: a user
who taps "Yes" and a user who types "yes" arrive at the agent as the
same string. Dropping ``msg.buttons`` when ``inline_keyboards=False``
was the worst of both worlds — the agent got told "Message sent with
N button(s)" while the user saw a question with no options.
Splice the labels into the message text instead. The LLM produces the
same ``message(buttons=...)`` call regardless of channel; the channel
layer picks the richest rendering it can afford — native keyboard when
enabled, bracketed inline text otherwise. Layout is preserved (one row
per line). Other channels can adopt the same helper incrementally.
Locks: canonical ``_buttons_as_text`` format, flag-off send-path
splices labels, flag-on send-path keeps content clean and rides
``reply_markup``.
Made-with: Cursor