Closes the operational gap from P6: when a sweep grid YAML carries
sim_variants, argo-lob-sweep.sh now emits ONE run-sweep-batched task
instead of N fan-out run-cell tasks. The new run-sweep template
invokes `fxt-backtest sweep` against the full grid (base64-encoded
inline as Argo parameter to avoid YAML special-char encoding traps).
The binary's P6 sweep() function handles cell × variant fan-out
internally via BatchedSimConfig::from_grid, so one pod processes all
4 windows × 140 variants sequentially. Trade-off: no inter-window
parallelism in this rev (4 quarters sequential in one pod ≈ firm-bound
2h wall per spec §9). 3-pod scale-out is P7 future work — needs the
script to split the YAML into per-window sub-grids and emit one
run-sweep task per sub-grid.
Backward-compat: legacy (no sim_variants) flow unchanged. The dry-run
of sweep_smoke.yaml continues to emit run-cell-* fan-out tasks; the
dry-run of sweep_deployability.yaml emits one run-sweep-batched task.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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