riorganizza struttura: sposta script in start/, aggiorna README, rimuove fit dalla root

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

start/plot_temperatura.py

@@ -0,0 +1,26 @@
+import pandas as pd
+import matplotlib.pyplot as plt
+from pathlib import Path
+
+ROOT = Path(__file__).parent.parent
+df = pd.read_csv(ROOT / "data.csv")
+df["time_s"] = df["time since start [ms]"] / 1000.0
+T0    = 105.0   # inizio finestra [s]
+T_END = 133.7   # fine finestra [s] — ultimo campione nel dataset
+
+df = df[(df["time_s"] >= T0) & (df["time_s"] <= T_END)]
+
+fig, ax = plt.subplots(figsize=(12, 5))
+
+ax.plot(df["time_s"], df["temp_amb IR [C]"], label="Temperatura ambiente", linewidth=1)
+ax.plot(df["time_s"], df["temp_obj IR [C]"], label="Temperatura scatola", linewidth=1)
+
+ax.set_xlabel("Tempo [s]")
+ax.set_ylabel("Temperatura [°C]")
+ax.set_title("Profilo termico scatola in forno")
+ax.legend()
+ax.grid(True, alpha=0.3)
+
+plt.tight_layout()
+plt.savefig(Path(__file__).parent / "plot_temperatura.png", dpi=150, bbox_inches="tight")
+plt.show()