v6.0.0-alpha.4

✨ Features

• Add result capacity hint for radius queries (@sdd)

• Add adaptive parallel tree construction (@sdd)

• Specialize within-radius result projection (@sdd)

🐛 Bug Fixes

• Handle padded stems in parallel construction (@sdd)

♻️ Refactor

• Within_unsorted to a visitor (@sdd)

• Switch from propagating points as indexes to actual values (@sdd)

🧪 Testing

• Add result collection threshold profiler (@sdd)

• Add v6 release parity benchmark suites (@sdd)

• Add point projection benchmark (@sdd)

🤖 CI

• Add stem strategy benchmark variant (@sdd)

• Rename basic benchmark variant (@sdd)

• Pass benchmark features explicitly (@sdd)

• Cap leaf benchmark tree size (@sdd)

• Fix leaf benchmark export filter (@sdd)

• Cap benchmark trees at 2^25 (@sdd)

• Fix benchmark v5-v6 chart matching (@sdd)

• Add ISA-specific stem benchmark reporting (@sdd)

• Add tree construction benchmarks (@sdd)

🧹 Chore

• Bump actions/download-artifact from 4 to 8 (@dependabot[bot], Signed-off-by:dependabot[bot] support@github.com)

• Bump actions/upload-artifact from 4 to 7 (@dependabot[bot], Signed-off-by:dependabot[bot] support@github.com)

• Bump actions/setup-python from 5 to 7 (@dependabot[bot], Signed-off-by:dependabot[bot] support@github.com)

• Add external comparison and projection tooling (@sdd)

• Remove projection design markdown (@sdd)

• Remove throwaway projection benchmark (@sdd)