fix: ensure parent profile bindings are collected during reference resolution

[patrick-werner]

This pull request addresses an important bug in the reference collection logic and improves the robustness of reference resolution for parent profiles and nested dependencies. The main change is the introduction of a fixed-point algorithm to ensure that all relevant references, including those introduced via parent profile hierarchies, are fully resolved. This prevents missing resources and improves correctness, especially for complex, multi-level dependencies.

Reference resolution improvements:

• Added a new resolve_references_to_fixpoint() method in capability_statement_expander.py that alternates between nested reference extraction and parent profile collection until no new resources are found, with a maximum of 10 passes to guarantee termination. This ensures that references from newly discovered parent profiles are not missed.
• Updated the changelog to document the bug fix and the new explicit fixed-point reference resolution logic, highlighting improved correctness for multi-level parent profile hierarchies and transitive dependencies.