#106167 widened the base contract to SendResult but left six native-batch
overrides (Discord, Email, Matrix, Mattermost, Slack, Telegram) returning
None, which (a) meant a media-only reply on those platforms still reported
FAILURE because _record_delivery(None) records nothing, and (b) produced new
`ty` invalid-method-override diagnostics against the widened base (#106192).
Make the contract honest instead of annotating it Optional: each override
now rolls its batches (and any per-image fallback) into one SendResult, so
the turn-outcome accounting works on every platform, not just Signal and
the base loop. The "legacy overrides return None" comment in
_send_image_batch goes away with the legacy.
ty on the 8 touched files: origin/main 241 diagnostics / 20 override,
this branch 241 / 20 — byte-identical diagnostic set; the intermediate
`-> SendResult` head without this commit had 246 / 25.
Refs #106192
91adf584a4