Release notes: 2026-05-27 — studio-sim-rl-env-pool-step¶

Status: Ready for review
Repo: li-langverse/lic
Branch: feat/studio-real-implementation
PH / REQ: PH-SIM SIM-3, Li Studio real implementation

Summary (one sentence)¶

studio_sim_step_hook for the sim_rl profile now runs env_pool_stub_step on the caller's SimSessionStub instead of a detached sim_rl_tick_stub self-test plus a single sim_step.

Changed (specific)¶

Area	What	Evidence
`li-sim`	`sim_rl_session_env_pool_step` — shared env-pool batch + contract checks	`env_pool_stub.li`, `sim_rl_tick_stub`
`li-studio`	`studio_sim_rl_step_hook`; RL branch early-returns after pool step	`studio_sim_rl_step_hook.li`, `studio_sim_step_by_profile.li`

Not changed (scope fence)¶

PH-ML async workers, persistent EnvPool in li-ml-rl — not in this change.
Game physics session coupling — not in this change (studio_game_step_hook still uses ephemeral PhysicsWorld).
Oracle / tier-2 bench claims — none.

Breaking changes¶

None — RL profile studio_sim_step_hook now advances tick by sim_rl_env_pool_size_default() (4) per frame instead of 1; callers depending on tick==1 after one hook call should use pool size (smokes updated).

Downstream¶

Repo	Action
Native timeline	Expect `tick += pool_size` per RL frame until persistent pool lands
`li-ml-rl`	Re-export `sim_rl_session_env_pool_step` when package scaffold merges

CHANGELOG entry (paste into Unreleased)¶

### Added
- **PH-SIM SIM-3 studio RL step** — `studio_sim_rl_step_hook`, `sim_rl_session_env_pool_step`; `sim_rl` profile in `studio_sim_step_hook` batches env pool on live session; smokes `studio_sim_rl_step_hook.li`, extended `studio_sim_step_by_profile.li`.