Release: promote jvspatial 0.1.0 compatible jvagent RC

[eldonm]

Purpose

Promote merged jvagent #249 from dev into main so 0.1.8rc19 can be tagged and published to TestPyPI. This is the compatible candidate for published jvspatial==0.1.0 and unblocks Integral Core's clean artifact gate.

Integration

• Merge dev with current main, retaining the 0.1.8rc19 and jvspatial==0.1.0 pins across package metadata and both requirements files.
• Resolve the jvspatial integration reference to the published release and remove its stale 0.0.22 version statement.
• Preserve main's 0.1.8rc18 release history.

Gates

• Local merge commit and pre-push pre-commit checks, including pytest, passed.
• Full PR CI must pass before merge. After merge, confirm the main-commit tests, auto-tag, TestPyPI publish, and fresh installation of jvagent==0.1.8rc19 against the published jvspatial wheel.
• Integral Core PR chore(deps): bump react, react-dom and @types/react in /jvchat #65 remains a draft until its Git override is removed and its independent artifact and full release gates pass.