Optogenetic stimulation is added to sessions on programs that never drive the LED #55

Part of #43. The nwb-convert benchmark compares each agent's optogenetic stimulation with the reference, and 166 reference sessions had stimulation where the agents had none. The reference is wrong for those sessions.

Seiler2024OptogeneticInterface.add_to_nwbfile builds an OptogeneticSeries at the reward times for every opto session and skips only the omission and footshock probe programs. In the MED-PC programs in MSNs/, only the STIM, SCRAM and WStim programs switch on the LED output (ON ^STIM). The plain food programs do not, so these sessions had no light:

• DMS Inhibitory: 163 sessions (EYFP 69, NpHR 52, NpHRScrambled 42) on FOOD_FR1 TTL Left (84), FOOD_FR1 TTL Right (53) and FOOD_FR1 HT TTL (Both) (26), mostly Group 2's FR1 days before light began at RI30.
• DMS Excitatory: 3 sessions on 2020-10-28 (281.402 and 282.402 on FOOD_RI 60 RIGHT TTL, 291.407 on FOOD_RI 60 LEFT TTL).

Separately, 8 scrambled sessions have a one-sample, zero-power OptogeneticSeries. Their stimulation array Z is empty, and create_optogenetic_stimulation_timeseries returns a single baseline sample when given no onsets. The early return for sessions without stimulation times only covers the reward-based path.

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