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Release notes: 2026-05-25 — studio-sim-profile-bridge

Status: Ready for review
Repo: li-langverse/lic
Branch: feat/studio-gap-close-wave1
PH / REQ: PH-SIM SIM-0, PH-UX-05
Author: agent

Summary (one sentence)

PH-SIM SIM-0 read-only bridge: map studio_profile_* ids to sim_contract_*, apply StudioProjectConfig onto SimSessionStub (output_detail + contract id) without stepping.

Agent continuation (required)

  1. Read: packages/li-sim/src/lib.li (SIM-0 block), packages/li-studio/src/lib.li (studio_apply_profile_to_sim), docs/game-dev/specs/li-engine-unified-sim-rfc.md.
  2. Run: lic check packages/li-sim/src/lib.li; lic check packages/li-sim/li-tests/smoke/studio_profile_bridge.li; lic check packages/li-studio/src/lib.li.
  3. Then: PH-SIM SIM-1 — sim_reset / sim_step on SimWorld per unified-sim RFC (no Studio duplicate physics).
  4. Blocked on: full engine tick / lis MCP sim_set_profile persistence — none for this merge.

Changed (specific)

Area What Evidence
packages/li-sim sim_contract_*, li_sim_profile_from_studio_id, SimSessionStub, sim_session_apply_studio_profile li-tests/smoke/studio_profile_bridge.li
packages/li-studio import sim, studio_apply_profile_to_sim; studio_profile_sim_robotics → 4 (matches li_rt) smoke + composable
packages/li-studio/li.toml path dep li-sim package resolve
li-tests/composable import_studio_sim_profile_bridge.li monorepo manifest
docs/release-notes/2026-05-25-studio-sim-profile-bridge.md this file agent continuation

Not changed (scope fence)

  • sim_reset / sim_step / SimWorld — not implemented (SIM-1).
  • lis MCP HTTP sim_set_profile file write — not wired.
  • Tier-2 bench summaries / run_simulation stepping — not changed.
  • LLVM / httpd / tier5 — not touched.

Breaking / Security / Performance / Downstream

  • Breaking: studio_profile_sim_robotics() constant corrected from 5 to 4 (aligned with runtime/li_rt.c); callers hard-coding 5 for robotics must update.
  • Security: N/A — read-only int mapping, no I/O.
  • Performance: N/A — O(1) field writes on stub.
  • Downstream: li-studio now depends on li-sim; composable agents should import both for profile bridge smokes.

CHANGELOG entry (paste into Unreleased)

### Added
- **PH-SIM SIM-0 studio→sim profile bridge** — `li_sim_profile_from_studio_id`, `SimSessionStub`, `studio_apply_profile_to_sim`; smokes `studio_profile_bridge.li`, `import_studio_sim_profile_bridge.li` — [2026-05-25-studio-sim-profile-bridge.md](docs/release-notes/2026-05-25-studio-sim-profile-bridge.md).