Extends the C# type-reference resolver (#1466) to be namespace-aware,
advancing the #1318 shadow-node umbrella for C#:
- The namespace is folded into the C# node id (_make_id(stem, namespace,
name)), so two same-named types in different namespaces in one file no
longer collapse — replacing #1466's detect-and-skip workaround for
multi-namespace files.
- Lexical per-block using-scope: a `using` applies only where it is in
scope (file-level, or the enclosing namespace block via a scope chain),
so sibling namespace blocks no longer share each other's usings.
- Qualified references (`Namespace.Type`) resolve via in-scope aliases
(`using Q = X.Y`) then exact known namespaces; generics are stripped.
Preserves (and tightens) the refuse-rather-than-guess discipline: a bare
reference resolves only when exactly one in-scope namespace provides the
type; an ambiguous reference (e.g. `using A; using B;` both defining
`Widget`) resolves to nothing rather than fanning out. Verified: `using A`
-> A.Widget only; ambiguous -> no edge; qualified `B.Widget` -> B.Widget
regardless of usings; sibling-block using-scope isolated; no dangling
edges or fan-out.
Reconciled onto current v8 (the PR predated the C++/ObjC member-call
resolvers); full suite green, the C++/ObjC resolution coexists.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
TheFedaikin
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