fix(diagnostics): reject reserved/builtin type names used as identifiers (issue 0076)

A value binding (local/global `var` or a parameter) spelled as a
reserved/builtin type name parses as a `.type_expr` rather than an
`.identifier` (parser.zig, via `Type.fromName`), so the address-of
family in lower.zig never saw a scoped local and mis-lowered it —
loading the aggregate and passing it by value to a `ptr` parameter
(LLVM verifier abort, or a silent `*self`-mutation-losing copy).

Add a declaration-site diagnostic in semantic_diagnostics.zig
(`UnknownTypeChecker.checkBindingName`): reject any parameter name or
`var` binding name (`:=` / typed-local / global forms) whose spelling
collides with a reserved type name. `isReservedTypeName` defers to the
parser's own classifier (`types.Type.fromName`) so the rejected set
never drifts from the set that would parse as a type — the named
builtins (bool/string/void/f32/f64/usize/isize/Any) and `[su]N` over
sx's 1-64 range. Bare value names (`s`, `self`, `index`) are untouched.
No lowering special-case; the `.identifier`-only address-of paths are
correct once type-shaped names can never be bound. The rejected
attempt-1 `bareVarName` approach was never landed.

Tests:
- 0125-types-type-named-var-rejected: `:=` form (s2) rejected
  (repurposed from the old test that asserted the now-illegal behavior).
- 1119-diagnostics-reserved-type-name-as-identifier: parameter (u8),
  typed-local (s64, bool), `:=` (string) forms rejected.
- 0135-types-self-streaming-nonreserved: positive — `*self` streaming
  with non-reserved names accumulates correctly via both call styles.
- 0904-optionals: renamed incidental locals s1/s2 -> filled/empty.

examples/0904-optionals-any-to-string-optional.sx

@@ -23,9 +23,9 @@ S :: struct {
 }
 
 main :: () {
-    s1 := S.{ a = 42, b = "hi", c = true };
-    print("{}\n", s1);
-    s2 := S.{ a = null, b = null, c = null };
-    print("{}\n", s2);
+    filled := S.{ a = 42, b = "hi", c = true };
+    print("{}\n", filled);
+    empty := S.{ a = null, b = null, c = null };
+    print("{}\n", empty);
     0;
 }