Show live progress on a dispatched sub-agent's transcript row - #352
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A task call's row painted a bare dot until its result landed, so a parent that dispatched several sub-agents at once had no way to tell a worker mid-turn from one that had gone silent — every unfinished dispatch looked identical. The sub-agent session store already tracks each worker's current tool and now its last activity clock; the runtime bridge polls it on the same cadence it already ticks the chrome and rewrites each outstanding task call's row in place with elapsed time, current tool, and a mark that tells working apart from stalled. The row itself never grows an extra line and the rewrite touches only that one row, regardless of how many other rows sit above it. Resolving a dispatch drops its live elapsed-time trailer for the result's own answer rather than leaving the last progress reading stuck on a finished row.
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Summary
taskcall row now updates in place with liveelapsed time, its current tool, and a mark that distinguishes actively
working, quietly finished, and stalled (no progress signal past 30s).
SubAgentSessionStoresessions(status, currentToolName, startedAt, plus a new
lastActivityAt) areread on the existing chrome poll cadence and folded into the row the
runtime bridge already tracks by callId — no new event channel.
in favor of the result's own answer, fixing a case where a stale
in-flight stat could survive onto a finished row.
Verification
bun run typecheckbun run buildbun run test— 3912 pass, 0 failconcurrent dispatches (two working, one resolved):
Closes CL-5576