Update README with Three-Pane Parallel Layout details

Added description for the Three-Pane Parallel Layout.

Author: hyperpolymath

README.adoc

@@ -91,7 +91,13 @@ It is:
 === The Three-Pane Parallel Layout
 
 [cols="1,3"]
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 |===
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+|Pane-A (Ambient)
+|Persistent context and environmental support. The background layer that maintains continuity, absorbs state, and reduces the need for active cognitive management.
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 |Pane-L (Symbolic)
 |Strict logic, types, and constraints. The symbolic and contractual layer — “the law” governing inference and action.