Three fixes addressing Codex review feedback:
1. Streaming opt-in: change streamingEnabled from (blockStreaming !== false) to
(blockStreaming === true) so accounts without an explicit blockStreaming setting
preserve their agent blockStreamingDefault instead of having edit-in-place
streaming silently enabled.
2. Text limit: apply textLimit truncation in schedulePatch and flushPendingPatch
before sending/patching. Intermediate preview posts only need the first chunk;
final delivery goes through deliverMattermostReplyPayload which applies full
chunking. This prevents oversize patch loops when responses exceed the limit.
3. Reply target divergence: when the final payload carries an explicit replyToId
that resolves to a different root than the streaming post was created under
(e.g. a [[reply_to_current]] directive), skip the in-place patch and fall
through to normal delivery so the reply lands in the correct thread. Any
orphaned stream post is deleted before the correct reply is sent.
7ed3db579f