Release graph-tool-call 0.40.0

[SonAIengine]

Summary

• bump package and public version metadata to 0.40.0
• publish release notes for bounded dense-catalog dependency construction, structured semantic retrieval, deterministic ranking, and Kiwi fallback
• freeze v0.40.0 dependency-chain and observability evidence
• update README and benchmark evidence links to the new release artifacts

Validation

• make release-check
• 1269 passed, 3 skipped
• Ruff lint and format checks
• reproducible dependency-chain and observability evidence
• wheel/sdist twine check
• clean-wheel public demo smoke