A worker's tool execution is single-threaded, so two bridge_ask calls from the
same session can only be a transport retry — yet openAsk minted a fresh turnId
each time and both raced to resolve the primary's single forward waiter, the
loser returning NO_WAITER and leaving a dangling turn (observed as turnId #2 in
the live e2e). Now openAsk is idempotent per session: a second open ask coalesces
onto the existing turnId + answer future (fresh=false), and only the fresh owner
surfaces the question and tears the turn down. closeAsk clears the per-session
index (conditional by value) so a later ask reopens fresh.
Implemented by an off-subscription worker delegated over the bridge; reviewed and
validated on the primary (IDE-clean, mvn clean install 149 green, +2 tests:
concurrent double-ask coalescing + post-close reopen).
Dai Ha
4aa9d03da2