Choice-only RLSSM: ssms.rl presets (ssm-simulators >= 0.13) not buildable through the RV path — smoke tests skipped

Summary

ssm-simulators 0.13 ships the choice-only RL presets (ssms/rl/preset.py: 2AB_RW_InvTempSoftmax et al.). HSSM's config layer already bridges them, but the RV/simulator path does not — building an hssm.RLSSM from a preset produces a fallback RV that crashes at logp-compile time with a cryptic numba error. The four smoke tests in tests/rl/test_choice_only_rl.py::TestChoiceOnlyRealSSMSSmoke are skipped pending this wiring (previously they were skipped implicitly because no released ssm-simulators had ssms.rl; the aDDM PR #967 bumping the pin to >=0.13.1 was the first branch to un-skip them).

State per preset (ssm-simulators 0.13.1)

model_config registers the decision-process kernels as inv_temp_softmax_2/3/4 instead.

Failure mechanism

1. RLSSMConfig.from_ssms_model("2AB_RW_InvTempSoftmax") works — resolves via ssms.rl, maps decision_process = "inv_temp_softmax_2" (registered), param list correct.
2. hssm.RLSSM(...) RV construction passes the preset name to ssms.hssm_support, which only knows model_config names → warns You supplied a model '2AB_RW_InvTempSoftmax', which is currently not supported in the ssm_simulators package and installs a fallback RV.
3. The fallback RV's perform closure captures an unpicklable ssms State object; model.compile_logp() under the numba backend then dies in cloudpickle:
   TypeError: cannot pickle 'State' object (numba object-mode lifting of the RV perform).

Repro

# on a branch with ssm-simulators >= 0.13.1 (e.g. PR #967)
uv run pytest "tests/rl/test_choice_only_rl.py::TestChoiceOnlyRealSSMSSmoke" -q
# before the skip-guard fix: 2 failed (2AB/3AB), 2 skipped; after: 4 skipped

Fix directions

• HSSM side: have the RLSSM RV construction use the resolved decision-process/kernel name (or the ssms.rl preset simulator) instead of forwarding the preset name to hssm_support.
• ssm-simulators side (alternative/complementary): register the RL presets in model_config, or extend hssm_support to consult ssms.rl.resolve_model.
• Robustness (secondary): an unsupported model currently warns and then fails much later with the opaque numba pickle error — consider raising cleanly at construction instead.

The skip guard added in PR #967 keys on model_name in ssms.config.model_config, so the tests un-skip themselves as soon as either fix lands.

Discovered during the full-suite validation of #967 (aDDM), which first resolved ssm-simulators 0.13.x.

🤖 Generated with Claude Code

Run the four smoke tests in tests/rl/test_choice_only_rl.py::TestChoiceOnlyRealSSMSSmoke with ssm-simulators 0.13.1, then trace RLSSMConfig.from_ssms_model and RLSSM RV construction through hssm_support. The work is complete when the choice-only presets build without the fallback RV and all four smoke tests run successfully, including compile_logp.