Update README.adoc

Author: hyperpolymath

README.adoc

@@ -93,3 +93,22 @@ It should not be placed between Kategoria/Katagoria and TypeLL as a required dep
   QTT overestimates wall-clock time; tropical grades give the tighter bound.
 
 See `docs/ARCHITECTURE.adoc`, `docs/PIPELINE.adoc`, and `ROADMAP.adoc` for full detail.
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+TypeFix Zero is a proposed standalone calibration calculus for the type-theory pipeline.
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+It is not a production language and not a replacement for TypeLL. Its role is to mark the lower bound of the estate’s “typed but Turing-complete” design space:
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+stratified universes / metasets: Type i : Type (i + 1)
+ordinary function types: A -> B
+natural numbers as the minimal observable data type
+lambda abstraction and application
+one explicit fixed-point primitive: fix : (A -> A) -> A
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+The key distinction is that TF0 separates:
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+a total mathematical fragment suitable for proof-like reasoning
+an explicitly partial fragment introduced only through fix
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+This makes TF0 useful as a test object for TypeLL, Kategoria/Katagoria, and typed-Wasm discussions: it exposes exactly where Turing completeness enters and exactly where proof-theoretic totality stops.
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+Status: proposed standalone repository; design-stage.