Composes 11 child graphs into single parent via cuGraphAddChildGraphNode.
Counter increments (GPU-side), IQL modulate, PER priority update all
captured as child graph nodes. PhaseEvents removed — single parent launch
makes per-child event profiling irrelevant.
Step 0 runs ungraphed + captures all 11 children + composes parent.
Steps 1+ replay via single cuGraphLaunch on the training stream.
After graph launch: only pinned scalar reads (nanoseconds, no GPU ops).
Child graph order:
counters -> spectral -> forward -> ddqn -> aux -> post_aux ->
adam_grad -> adam -> maintenance -> iql_modulate -> per_priority
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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