Records the durable per-session run-registry implementation (bridge branch
fix/gateway-durable-run-registry): T7 gateway-unconfirmed fallback, T8 terminal
result cache, T9 DeadlineAt interrupt — with the trade-offs (no gatewayruntime
pending-map rewrite; per-session in-memory store not yet cross-restart durable;
T9 only force-terminates when the gateway is unconfirmed) and the test names that
cover each.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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