Adds crates/ml-alpha/src/rl/{mod,common,isv_slots}.rs scaffolding
for the integrated RL trainer per the plan at
docs/superpowers/plans/2026-05-22-integrated-rl-trainer.md.
Phase A lands only the module structure + Transition struct +
12 ISV slot constants (400-411). Subsequent phases (B-H) wire the
encoder gradient hookup, DQN/PPO heads, training loop, Argo
workflow, and backtest gate.
Per pearl_controller_anchors_isv_driven and
feedback_isv_for_adaptive_bounds, every adaptive hyperparameter
documented in the slot constants is sourced from ISV (not from
hardcoded const). Controller kernels (producers) land in phases
C/D/E/F.
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