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Vance Ingalls
0393ba5be2
Promotes the opt-in HF_DE_PARALLEL_STREAM mechanism (#2056) into the auto-routing decision, gated behind its own default-off flag (HF_DE_PARALLEL_ROUTER). This is the next step from the 2026-07-08 parallel-DE benchmark verdict: par3/single 1.16-1.36x on real-work comps >=2,000 frames, no comp anywhere losing to single-worker. shouldPreferParallelDrawElement mirrors shouldPreferSingleWorkerDrawElement (#2026) but takes priority over it when both are eligible — its higher default threshold (HF_DE_PARALLEL_MIN_FRAMES=2000 vs the inversion's 900) means it only ever picks up the long tail the inversion's own benchmark didn't cover. Fixed at 3 workers (benchmark-validated; not calibration- derived), same shape as the inversion pinning to a fixed 1. resolveParallelRouterRetryPlan mirrors resolveInversionRetryPlan for the self-verify-failure rollback path: falls back to the ordinary (non-DE) parallel-disk path at the pre-router worker count. The caller must clear HF_DE_PARALLEL_STREAM before recomputing useStreamingEncode or the retry would keep resolving to the parallel-streaming shape. New telemetry (de_parallel_router, de_pre_router_workers) tags which render used the router, separate from de_worker_inversion — needed before the planned telemetry soak can segment revert-rate and de_verify_min_db to the parallel cohort specifically; today there's no way to tell those apart from ordinary single-worker DE renders. Verified end-to-end: HF_DE_PARALLEL_ROUTER=true on a 2,381-frame comp resolves to 3 workers with 3 separate drawElement sessions and renders successfully; without the flag, behavior is unchanged (falls through to the existing single-worker inversion, workerCount=1) — no regression to current production routing. 114 orchestrator tests pass (15 new).