Resolve qq-bridge.mjs by keeping the inbound-file support (hasFiles,
files passthrough) and dropping the upstream stream session, which
this branch replaces with the discrete turn-feed notices.
Show what the agent is actually doing during a turn, the way Claude
Code does: interim explanation text, every Tool call, and the error
detail when a tool fails, each as its own pushed message before the
final markdown answer.
- HarnessReplyTracker.consume now returns every frame of a polling
batch in order (same-batch text frames collapse to the latest)
instead of dropping all but the last event, which silently ate
tool-call frames that shared a batch with their result
- tool frames carry callId; status frames carry the correlated
toolName and a flattened error text parsed from the tool/result
error payload (message, or name: code)
- the QQ bridge holds interim step text until the next tool call
(or the end of the turn) pushes it, emits 'Tool call <name>' per
call, emits 'Tool call <name>\nError: <reason>' for failures, and
skips re-sending interim text that already equals the final answer
Other channels keep their existing behaviour: the status frame still
reads '正在整理结果…' and they ignore the new optional fields.
