Peter Steinberger 83303f1ba8 feat(channels): batch 1 producers drop media placeholder bodies (#111447) ...

* feat(channels): batch 1 producers drop media placeholder bodies

Media-placeholder program batch 1: Google Chat, Zalo, LINE, and
Mattermost stop minting <media:kind> placeholder bodies. Media-only
messages carry an empty caption plus one structured fact per native
attachment (type-only when a download fails or is rejected, so payload
positions and kind signals stay aligned). The shared
formatMediaPlaceholderText SDK formatter renders text-only carriers
(Mattermost pending-room lines) from structured facts; per-channel
placeholder builders and the expected-count side channel are deleted.

* fix(mattermost): satisfy type, deadcode, and SDK manifest gates

2026-07-19 10:32:09 -07:00

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