Add C++ Template Support with Instantiation Tracking

[san-rizz-777]

Changes Made

1. C++ Parser (languages/cpp.py)

• Added Tree-sitter query for template_declaration nodes
• Implemented _find_templates(): Extracts template definitions (name, location, source code)
• Implemented _extract_template_name(): Extracts names from function/class/struct templates
• Updated parse(): Returns templates under "templates" key
• Added Tree-sitter query for template instantiations (if applicable)
• Implemented _find_template_instantiations(): Captures template usage with arguments and locations

2. Graph Builder (tools/graph_builder.py)

Schema & Core Integration

• Added :Template uniqueness constraint in create_schema()
• Updated item_mappings: Added (file_data.get('templates', []), 'Template')
• Templates now automatically graphed when files are processed

Template Instantiation Tracking

• Implemented _create_template_instantiations(): Creates USES_TEMPLATE relationships between code elements and templates

  • Resolves template locations (local vs. imported)
  • Links instantiations to containing functions/classes
  • Falls back to File→Template relationship if no context found
  • Stores line numbers and template arguments

• Implemented _find_containing_context(): Determines which Function or Class contains a template instantiation by line number

• Implemented _create_all_template_instantiations(): Batch processes all template instantiations after file parsing

Features

Template definition detection
Template instantiation tracking
USES_TEMPLATE relationships with context
Template argument capture
Import resolution for external templates

Testing

Test with C++ code containing:

• Template definitions: template<typename T> class Vector {};
• Template instantiations: Vector<int> v;
• Template function calls: max<double>(1.0, 2.0);

#359

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[san-rizz-777]

@Shashankss1205 Please review pr!😁😁

[Shashankss1205]

@san-rizz-777 There's a bug because of which the end2end tests are failing, Please check that and make corrections on the PR.