* docs: tailor imsg skill for OpenClaw agents
* docs(imsg-skill): document that poll send echoes --question as a visible comment
* docs(imsg-skill): note inbound native poll question is backfilled from its caption
* docs(imsg-skill): document only shipped poll behavior
Drop the poll caption echo, --comment override, and inbound question
backfill from the imsg skill: those live in imsg PR openclaw/imsg#155,
not shipped imsg 0.12.2 (poll --help exposes only --question/--option).
Also removes the inaccurate 'reply comment whose reply_to is the poll
guid' framing — #155 sends the caption as a plain message, not a reply.
Keeps shipped poll send/vote usage. Re-add once a release ships #155.
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Co-authored-by: Omar Shahine <10343873+omarshahine@users.noreply.github.com>
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