docs: add volume 1 philosophical exploration

volumes/volume-1/explorations/codex/README.md

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+# Volume 1 Exploration
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+This workspace contains an independent philosophical exploration of Volume 1 of the Intellecton Sovereign Canon.
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+The focus is not summary. The aim is to test the canonical claims against three questions:
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+1. What exactly is being ruled out by the observer-conditioned partition function?
+2. Does the argument depend on physics, or on a stronger thesis about observers as conditions of intelligibility?
+3. What changes when the causal-set apparatus is read through cybernetics and phenomenology instead of only through quantum gravity?
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+The working hypothesis is that Volume 1 is best understood as a theory of constraint: not a theory of objects alone, but of which structures can remain available to an observer with memory. That makes the paper suitable for a philosophical venue while remaining faithful to the master key.
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