numerics-research: md-r2 neighbor cell-list gap (algo 105)

Evidence pack

• Study: docs/numerics/studies/2026-05-25-md-r2-neighbor-list-gap.md
• PR: https://github.com/li-langverse/lic/pull/310
• Bench id: md_lennard_jones (brute reference until cell parity)
• Gates: SIM_RESEARCH_VERTICAL=md SIM_RESEARCH_STUDY_ONLY=1 SIM_RESEARCH_REQUIRE_STUDY=docs/numerics/studies/2026-05-25-md-r2-neighbor-list-gap.md ./scripts/sim-algo-research-gates.sh

Finding

Registry algo 105 (md_neighbor_cell_list) has implemented_smoke: true but Li tier-2 li_md_compute_forces is O(N²) brute MIC; composable stub returns checksum 1.001.

Handoff

Implement sim-p1-md-neighbor-cell on cursor/sim-algo-plan-loop per study Phase A–B (brute/cell parity @ N=256 before perf).

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_migrated_from_github: li-langverse/lic#316 _github_url: https://github.com/li-langverse/lic/issues/316 _migrated_at: 2026-06-10T04:44:41Z