chore: release 1.5.0 changelog

[iamvirul]

Pull Request

Type of Change

• 🔧 Chore (build process, CI/CD, dependency updates)
• 📖 Documentation update

Description

Adds the 1.5.0 changelog entry to CHANGELOG.md ahead of the GitHub release tag.

Related Issues / PRs

Closes all work merged since 1.0.0:

• PR perf: code-tuned model, ANN index, O(files) stats, MPS/CUDA device detection #24 — feat/code-search-optimizations (LanceDB, ANN index, file_stats, fine-tuned model)
• PR perf: switch to fastembed ONNX backend + user-selectable model/backend #29 — perf/lazy-import-startup (fastembed ONNX backend, VECGREP_BACKEND/VECGREP_MODEL)
• PR chore: update repo URLs to VecGrep org #30 — chore/update-repo-urls (VecGrep org)
• PR chore: add .githooks pre-commit lint check #33 — chore/add-githooks (pre-commit lint check)

Checklist

• My code follows the project's style guidelines (ruff passes)
• I have performed a self-review of my own code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!