Add fully qualified name support for nested classes/modules#7
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Implement compact representation for qualified names (e.g., Api::V1::User)
using SmallVec to minimize heap allocations - up to 16 segments stored
inline on stack.
## Changes
### Type System (types.rs)
- Add QualifiedName struct with compact representation
- Single String for full name + SmallVec<[u16; 16]> for segment offsets
- O(1) operations: name(), parent(), child()
- Only 1 heap allocation regardless of nesting depth
- Update Type enum: class_name -> name: QualifiedName
- Add Type::instance() and Type::singleton() constructors
### AST Parsing (definitions.rs)
- Add extract_constant_path() to handle ConstantPathNode recursively
- Support both simple names (User) and qualified names (Api::V1::User)
### Scope Management (scope.rs)
- Add current_qualified_name() method
- Traverse scope chain to build fully qualified name from nested scopes
### Other Updates
- Update install_self() to use qualified names
- Migrate all Type::Instance { class_name } usages to Type::instance()
- Add comprehensive tests (127 total)
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Implement compact representation for qualified names (e.g., Api::V1::User)
using SmallVec to minimize heap allocations - up to 16 segments stored
inline on stack.
Changes
Type System (types.rs)
AST Parsing (definitions.rs)
Scope Management (scope.rs)
Other Updates