Add zig-planar, zig-select, zig-diffuse, zig-lsh, zig-rabitq, and zig-pq

[guanchzhou]

What

Adding six libraries I maintain: zig-planar (planarity testing, embeddings and planar graph coloring) under Data Structure and Algorithm, and five retrieval libraries under Large Language Model, next to faiss-zig: zig-select (budgeted selection of retrieved chunks), zig-diffuse (re-ranking by graph diffusion), and zig-lsh, zig-rabitq and zig-pq (approximate nearest-neighbor search).

Checklist

• Entry is actively maintained and useful
• Follows the awesome list style guide
• Added to the end of the existing list (not inserted in the middle)
• Ran make all locally before opening this PR

AI Attribution

Select one:

• No-AI — no AI involvement
• AI-generated — project is primarily generated by AI
• AI-assisted — human-led with AI assistance

Summary by CodeRabbit

• New Features
  • Added six project listings: zig-planar in Data Structures and Algorithms, plus zig-select, zig-diffuse, zig-lsh, zig-rabitq, and zig-pq in Large Language Models. These additions make the projects easier to discover in their respective categories.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 97d18b51-7568-4dc1-b290-3105949835e8

📥 Commits

Reviewing files that changed from the base of the PR and between 12e288a and c03d5a3.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README adds six Zig project entries: one for planar graph algorithms and five for LLM retrieval and approximate nearest-neighbor search.

Changes

Planar graph project

Layer / File(s)	Summary
Planar graph entry README.md	Adds a project entry describing planarity testing, embeddings, Kuratowski certificates, and 4- and 5-coloring of planar graphs.

LLM-related projects

Layer / File(s)	Summary
LLM project entries README.md	Adds five project entries covering retrieved-chunk selection, graph-based retrieval-score reranking, and approximate nearest-neighbor search using LSH, RaBitQ, and product quantization.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to c03d5

The README additions are ready to merge with no identified correctness or maintenance risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies all six libraries added by the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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