Simulate V(t) with Spike Detection

Simulate membrane voltage over 150 ms and count the spikes.

Your task:
1. Set up all 8 LIF parameters
2. Initialize: v = el, spike_times = []
3. Loop range(int(t_max/dt))
4. Each step:
   a. t = step * dt
   b. i_t = i_mean * (1 + np.sin(2 * np.pi * t / 0.01))
   c. v = v + (dt / tau) * (el - v + r * i_t)
   d. if v >= vth: append t to spike_times, reset v = vr
5. Print total spike count and first 3 spike times in ms