4f99fb0d85
attempt-3: extend the E4 single-hop bare-TYPE gate to parameterized type
HEADS (the constructor-head analog of the bare-leaf gate). Before this, the
head lookup hit the global struct_template_map / protocol_ast_map /
fn_ast_map *before* any source-aware visibility check, so a 2-flat-hop
imported generic struct/protocol/type-fn remained bare-visible (e.g.
`Box(s64)` when main imports only b.sx and b.sx imports c.sx).
- headTypeLeak: generic-struct / parameterized-protocol heads use the same
type-author single-hop model as the bare-leaf gate (moduleTypeAuthor +
flatTypeAuthorCount + localTypeInSource + nameAuthoredAsTypeAnywhere).
- headFnLeak: type-returning-function heads use single-hop function
visibility (isNameVisible), exempting scope-local mangled type-fns.
- Gated at every unqualified head site: resolveParameterizedWithBindings,
resolveTypeCallWithBindings, the scanDecls alias-decl dispatch (poisoning
the alias with .unresolved on leak), resolveArrayLiteralType, and the
generic-static-method call path. Namespaced (`ns.Box(..)`) heads are an
explicit qualified reach and stay exempt. Source-pinned instantiation
(E3/E4) is preserved, so library-internal heads still resolve where they
are visible.
Regression: examples/0764-modules-import-generic-head-non-transitive
(2-hop `Box(s64)` -> "type 'Box' is not visible", exit 1; direct #import
resolves). Fails-before on a250964 (printed 3), passes-after.
README: note the non-transitive rule covers parameterized type heads.
Gate: zig build 0, zig build test 0 (LSP 522, 423/423), run_examples
505/0, FFI 12xx/13xx/14xx green, 0706/0763/0544/0105 green & byte-identical,
m3te ios-sim build+launch exit 0.
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