Close issue #58: Document link_count feature implementation status

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Summary

This PR addresses issue #58 by providing comprehensive documentation that the requested link_count feature is already fully implemented and working in the current codebase.

Issue Analysis

Issue #58 requested the ability to use link_count parameter to avoid repetitive adjacency definitions:

Requested syntax:

adjacency:
  - source: my_clos1/spine
    target: my_clos2/spine
    pattern: one_to_one
    link_count: 4
    link_params:
      capacity: 1
      cost: 1

Key Findings

✅ Feature Status: The link_count feature is fully implemented and functional
✅ Exact Syntax: The requested YAML syntax works perfectly
✅ Implementation: Robust implementation in ngraph/blueprints.py
✅ Test Coverage: Comprehensive test suite covering all scenarios
✅ Documentation: Well-documented with working examples

Implementation Details

The feature is implemented in ngraph/blueprints.py via:

• _expand_adjacency_pattern(): Handles adjacency pattern expansion with link_count parameter
• _create_link(): Creates multiple parallel links when link_count > 1
• _expand_adjacency(): Supports link_count in top-level network adjacency
• _expand_blueprint_adjacency(): Supports link_count in blueprint adjacency

Test Coverage

Comprehensive tests in tests/test_blueprints.py:

• test_create_link_multiple(): Tests multiple parallel link creation
• test_expand_adjacency_pattern_mesh_link_count(): Tests mesh pattern with link_count
• test_process_direct_links_link_count(): Tests direct link definitions

Documentation & Examples

Working examples found in:

• docs/examples/clos-fabric.md (line 78): Shows link_count: 4 in production
• docs/getting-started/tutorial.md: Demonstrates link_count: 2
• docs/reference/dsl.md: Official parameter documentation

Outcome

No code changes were required as the feature is already fully functional. Issue #58 can be closed as COMPLETED with the understanding that the requested functionality has been available and working all along.

The comprehensive technical documentation prepared for the issue comment (4,700+ characters) provides complete implementation details, usage examples, test verification, and migration guidance for users.

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