v0.9.0 — Capability breadth through solid modelling

Five capability milestones (v0.5 through v0.9) closed after the 0.4.0 tag without a release being cut. This release closes that gap: the tag lagged the tree by 60 commits, so consumers pinning v0.4.0 could not reach planar offset, region algebra, projection, routing, or mesh/mesh proximity at all.

Milestones included

• v0.5 Trustworthy discrete geometry
• v0.6 Compiled geometry and plans
• v0.7 Measurement and validity
• v0.8 Mesh processing breadth
• v0.9 Solid modelling breadth
• partial v0.10 (mesh queries, decompose/compose)

Newly reachable for consumers

These shipped on main but were unreachable from the previous tag:

• axiolid-overlay planar offset and stroke offset
• axiolid-overlay persistent region with set ops and morphology
• axiolid-project planar projection and vertical prism clipping
• axiolid-route exact planar shortest path with typed unreachable reasons
• axiolid-measure mesh/mesh distance and proximity components

The facade also now re-exports project and route behind additive features.

See the changelog for the full list.