When `includeReasoning` is active (or `reasoningLevel` falls back to the
model default), the agent emits reasoning blocks as separate reply
payloads prefixed with "Reasoning:\n". Matrix has no dedicated reasoning
lane, so these internal thinking traces leak into the chat as regular
user-visible messages.
Filter out pure-reasoning payloads (those starting with "Reasoning:\n" or
a `<thinking>` tag) before delivery so internal reasoning never reaches
the Matrix room.
Fixes#24411
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
1298bd4e1b