The operator's mental model: a chat is a room, @X means "X takes the
turn", unmentioned participants keep working. Two separate gaps were
letting 张工程师 answer when the user wrote "@CEO 更新一下进度" inside
their Board↔张工程师 chat:
* `resolveMessageWakeTargets` always woke the DM recipient, regardless
of who the body @-mentioned. CEO woke too, but 张工程师 — the
addressed party — replied first and CEO's busy-queued wake arrived
after the operator had already taken the earlier reply as "the
answer". Explicit mentions now shadow the implicit DM recipient:
with mentions, only the named agents wake; the recipient still sees
the message in their inbox, they just aren't obliged to answer.
No mentions → fall back to the historical "DM wakes the recipient"
contract so every existing flow is untouched.
* `channel-utils` keyed each chat by `sort(fromAgent, toAgent)`. CEO's
reply with `toAgentId=__board__, parentMessageId=<original>` landed
in a fresh Board↔CEO pane — the exact "new session" the operator
complained about. Walk `parentMessageId` back to the root of the
reply chain and use the root's participant pair: every reply in a
thread now collapses into the chat the sender originally opened,
cycle-guarded against malformed parent pointers.
Pinned by a new unit test: DM to CTO with "@CEO 更新一下进度。" wakes
only CEO while keeping the message visible to both CTO's and CEO's
inbox.
ZacharyZhang-NY
af72f1b4d9