Generic type ops - #42
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…lization
a foldable operation in a type expression whose operand still mentions a type
parameter — `Array[Dim + 1]`, `-> I + 1`, `I < 10`, `S.startswith("foo")` — is
kept symbolic as a new `Type::Deferred` instead of eagerly collapsing to the
parameter's bound. when the parameter is specialized at a call site, the operation
re-runs with the same fold value inference uses, so `extend(x: Array[5])` infers
`Array[6]` rather than `Array[int]`
covers binary, unary, comparison and method-call operations. the literal folds are
shared with value inference (`literal_binary_op` / `literal_unary_op` extracted,
`deferred_comparison` added); a deferred operation behaves as its reduced form for
every purpose except type-mapping
…e safety
extend the symbolic-type-op transpiler pass to fold `Compare` (rich operators) and
positional method `Call` expressions in type positions to the type ty resolves them
to, matching the existing binary/unary folding. this keeps deferred-operation return
annotations like `-> I < 10` and `-> S.startswith("foo")` runtime-safe (they lower to
`-> bool`) instead of leaking a `TypeVar` operation that crashes at import
also give the deferred-type mdtest blocks real (non-raising) bodies so the runtime
divergence harness can execute them
…resolves `Type::Deferred` is a public enum variant, so `cargo doc -D warnings` rejects its doc comment linking to the `pub(crate)`-re-exported `DeferredType` (private-intra-doc-links). re-export `DeferredType`/`DeferredOperation` with `pub`, matching `OverlappingType`
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