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## Description
<!-- Provide a clear description of the changes in this PR -->
- Refactored `brute_force_triplet_search`, extracting memory projection.
- Built **TripletSearchContextProvider** (extends
**BaseContextProvider**) to create a single memory projection and
perform a triplet search for each entity.
- Refactored `entity_completion` into **EntityCompletionRetriever**
(extends **BaseRetriever**).
- Added **SummarizedTripletSearchContextProvider** (extends
**TripletSearchContextProvider**) for an alternative summarized output
format.
- Developed and tested an example showcasing both context providers,
comparing raw triplets, summaries, and standard search results.
## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Enhanced text summarization now delivers clearer, more concise
overviews of search results.
- Improved search performance with optimized context retrieval and
memory reuse for faster, more reliable results.
- Introduced advanced entity-based completion for generating more
relevant, context-aware responses.
- **Refactor**
- Streamlined internal workflows and error handling to ensure a smoother
overall experience.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Co-authored-by: Boris <boris@topoteretes.com>
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