chore(deps): bump io.github.jbellis:jvector from 4.0.0-rc.7 to 4.0.0-rc.8

[dependabot]

Bumps io.github.jbellis:jvector from 4.0.0-rc.7 to 4.0.0-rc.8.

Changelog

Sourced from io.github.jbellis:jvector's changelog.

4.0.0-rc.8

• release 4.0.0-rc.8 [#626](https://github.com/jbellis/jvector/issues/626)
• Refactor parallel writer [#608](https://github.com/jbellis/jvector/issues/608)
• Move buffer position in ByteBufferIndexWriter#writeFloats [#607](https://github.com/jbellis/jvector/issues/607)
• Ensure extractTrainingVectors return a list of at most MAX_PQ_TRAINING_SET_SIZE [#610](https://github.com/jbellis/jvector/issues/610)
• add config options for regression testing [#609](https://github.com/jbellis/jvector/issues/609)
• On-disk index cache for the Grid benchmark harness [#612](https://github.com/jbellis/jvector/issues/612)
• Improved dataset loading; fixes, safeties, diagnostics, and better feedback [#613](https://github.com/jbellis/jvector/issues/613)
• bump to next SNAPSHOT [#605](https://github.com/jbellis/jvector/issues/605)

Commits

• 8b3e93c chore: update changelog for 4.0.0-rc.8 (#627)
• 9d0488e release 4.0.0-rc.8 (#626)
• 570bd11 Refactor parallel writer (#608)
• 20c348e Move buffer position in ByteBufferIndexWriter#writeFloats (#607)
• d9ddce5 Ensure extractTrainingVectors return a list of at most MAX_PQ_TRAINING_SET_SI...
• d663b4f add config options for regression testing (#609)
• 7e493ee On-disk index cache for the Grid benchmark harness (#612)
• e263cc8 Improved dataset loading; fixes, safeties, diagnostics, and better feedback (...
• 6b235ce bump to next SNAPSHOT (#605)
• See full diff in compare view

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[claude]

Dependency Bump Review: jvector 4.0.0-rc.7 to 4.0.0-rc.8. One-line change in engine/pom.xml. The rc.8 release includes two notable bug fixes: (1) Move buffer position in ByteBufferIndexWriter#writeFloats - a correctness fix preventing potential vector index data corruption; (2) Ensure extractTrainingVectors caps at MAX_PQ_TRAINING_SET_SIZE - prevents excessive memory pressure during PQ index construction. There is also an internal refactor of the parallel writer that these fixes depend on, plus lower-risk benchmark/diagnostic additions. The bug fixes are worth having, but since this is still a release candidate (rc.8), the parallel writer refactor carries some risk. Recommend running HnswVectorIndexTest and related vector index tests before merging. The existing do-not-merge label is appropriate if waiting for the stable 4.0.0 release.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -9.62%	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (9639232)	105406	78574	74.54%
Head commit (dbff09d)	135965 (+30559)	88268 (+9694)	64.92% (-9.62%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#3439)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.75%. Comparing base (9639232) to head (dbff09d).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3439      +/-   ##
==========================================
+ Coverage   65.65%   65.75%   +0.10%     
==========================================
  Files        1518     1518              
  Lines      105406   105406              
  Branches    21826    21826              
==========================================
+ Hits        69204    69313     +109     
+ Misses      26859    26756     -103     
+ Partials     9343     9337       -6     

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