feat: rigorous biophysics reconstruction for Paper 2

Closes #118, #119, #120, #121

papers/references/Albantakis2023_Placeholder.md

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+# Integrated information theory (IIT) 4.0: Formulating the properties of phenomenal existence in physical terms (Albantakis 2023)
+
+This reference updates IIT to 4.0, formalizing the Intrinsic Difference metric over marginal states.
+Due to copyright and its format, the full PDF is not hosted in this repository.
+
+**Citation:**
+Albantakis, L. et al. (2023). *PLOS Comput. Biol.* **19**, e1011465.

papers/references/Bastos2012_Placeholder.md

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+# Canonical microcircuits for predictive coding (Bastos 2012)
+
+This reference defines the anatomical pathways of the cortical microcircuit (L2/3, L4, L5, L6) and how they implement active inference.
+Due to copyright and its format, the full PDF is not hosted in this repository.
+
+**Citation:**
+Bastos, A. M. et al. (2012). *Neuron* **76**, 695.

papers/references/Oizumi2014_Placeholder.md

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+# From the phenomenology to the mechanisms of consciousness: Integrated Information Theory 3.0 (Oizumi 2014)
+
+This reference formalizes IIT 3.0 and the Earth Mover's Distance.
+Due to copyright and its format, the full PDF is not hosted in this repository.
+
+**Citation:**
+Oizumi, M., Albantakis, L., Tononi, G. (2014). *PLOS Comput. Biol.* **10**, e1003588.