* fix(comments): cap completion-fallback comment synthesized from raw output (#5455)
On long, tool-heavy runs some runtimes emit the entire raw execution stream
(text deltas + a `tool call` line per tool_use) as the task's final Output.
When the agent left no comment of its own, CompleteTask synthesizes a fallback
comment from that Output and posted it verbatim, dumping 190-264KB raw streams
onto the issue thread (author_type=agent, type=comment, source_task_id=NULL).
Cap the synthesized body: redact then truncate to a head that comfortably fits
a real final message, appending a marker naming the omitted length instead of
the multi-hundred-KB tail. Normal short outputs are unchanged.
* test(comments): pin completion-fallback comment cap (#5455)
Covers passthrough for real short messages, exact-cap boundary, rune-based
(not byte) counting for multibyte content, and the reporter's fingerprint —
a narration head followed by hundreds of `tool call` lines — asserting the
stored body is bounded, the head preserved, and a truncation marker appended.
* fix(comments): replace oversized fallback output with safe notice
Co-authored-by: multica-agent <github@multica.ai>
---------
Co-authored-by: Eve <eve@multica-ai.local>
Co-authored-by: multica-agent <github@multica.ai>
