Each entity's tessellation now lives alongside its definition in
entities/*.rs, attached to the entity type via a local trait:
LegacyTess — Viewport / Insert / Hatch / Ole2Frame
(fallback path for entities not on the truck pipeline)
LeaderTess — Leader
MultiLeaderTess — MultiLeader
DimensionTess — Dimension (carries its dim-only helpers too:
~1700 lines of dim_geometry, dim_text_*, format_*,
tolerance, suppression, etc.)
scene/tessellate.rs keeps only the cross-entity dispatcher plus the
shared dim machinery reused by leader/multileader/dimension
(ArrowKind, DimGeom, append_arrow, arrow_from_block, add_segment,
add_polyline, normalized_or, push_tri, color_or_inherit, entity_z,
offset_snap_pts). Cross-entity arc helpers + aci_to_rgba moved to
scene/tess_util.rs.
scene/tessellate.rs shrinks from ~3300 to 809 lines. Compile clean,
all 9 tests pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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