Bump to lance-graph 0.5.1 with catalog cache

[prrao87]

Bumps lance-graph to v0.5.1. This version of lance-graph contains a new CypherEngine that reuses (caches) the catalog, so each time a new query runs, the engine doesn't need to rebuild the catalog. See lance-format/lance-graph#124

This improves performance by more than 2x in some queries (where rebuilding the catalog was a significant fraction of runtime). For more expensive queries, it's expected that the reusable cache doesn't help much as most of the time is spent in query execution.

[Copilot]

Pull request overview

This pull request bumps the lance-graph dependency from version 0.4.0 to 0.5.1, which introduces a new CypherEngine API that caches the graph catalog to avoid rebuilding it for each query. This improvement delivers significant performance gains, with some queries showing more than 2x speedup.

Changes:

• Updated lance-graph dependency from 0.4.0 to 0.5.1 in pyproject.toml and uv.lock
• Modified query.py to optionally use CypherEngine with catalog caching when available, while maintaining backward compatibility
• Updated all benchmark tests to pass the cached engine instance
• Added new benchmark results showing performance improvements and archived old results
• Updated documentation with new benchmark numbers

Reviewed changes

Copilot reviewed 7 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
uv.lock	Updates lance-graph from 0.4.0 to 0.5.1 with new package hashes and manylinux version
pyproject.toml	Updates lance-graph minimum version requirement to 0.5.1
lance_graph/query.py	Adds CypherEngine import with fallback, ENGINE_CACHE for catalog caching, get_engine() helper, and updates all query functions to accept optional engine parameter
lance_graph/benchmark_query.py	Updates fixture to create and cache engine instance, propagates engine to all benchmark tests
results/lance-graph-0.5.1.txt	New benchmark results showing improved performance
results/archive/lance-graph-0.4.0.txt	Archived previous benchmark results
results/benchmark_plot.png	Regenerated plot with updated benchmark data
lance_graph/README.md	Updates embedded benchmark results to reflect new performance
README.md	Updates high-level results table with new lance-graph-0.5.1 timings

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