Merge branch 'worktree-viridian-forest' into 20260726_various_fixes

# Conflicts:
#	data/voxel_heights.lua

CHANGELOG.md

@@ -72,6 +72,38 @@
 
 ### Added
 
+- **Viridian Forest grows real trees.** Nearly everything drawn in the
+  forest is ROUND, and the detector was boxing all of it: the big trees
+  came out as ragged mixed-height volumes (their sparse canopy-rim
+  tiles read 0px against 32px bodies, leaving gap-toothed hedge walls),
+  the stump rows merged into 16px crate walls wearing folded stump art,
+  and the trail signs were broken piles -- their $32 tile is the
+  water-fallback trap and recessed into a pond lip in the middle of the
+  woods. All of it is now profile-pinned to the treatments the rest of
+  the world already uses: every tile of the tree drawing (ball, rim
+  wisps, feet) and the stumps take the per-cell voxel HULL the overworld
+  border forest wears -- a tree spans 2x2 cells, so its four
+  quarter-hulls tile into one big lumpy canopy, and each stump becomes a
+  round bollard; the signs take the standing thin-slab `signpost`
+  treatment every town sign gets; and the white sparkle filler inside
+  the tree masses is flat ground instead of an invisible zero-height
+  box. The whole map now resolves to hulls, signs, ledges and ground --
+  a detector sweep finds no stray boxed column anywhere.
+
+  Two refinements over the first cut, both new hull-builder abilities.
+  A tree's drawing spans 2x2 CELLS, and per-cell hulls unfolded it onto
+  the ground -- the ball's top half sat one cell north of its bottom
+  half at the same elevation, reading as a tree cut in half. The new
+  `canopy` class pins the drawing's corner tile as a group anchor and
+  the whole 2x2-cell drawing carves as ONE 32px hull, so every tree is
+  a single tall round canopy (the carver is now parametric over its
+  canvas size, and hull stamps carry their footprint radius). And the
+  stumps' drawn tops are a CUT FACE -- an ellipse of growth rings seen
+  at an angle, not body: the new `stump` class builds the hull from the
+  bark rows alone and projects the ellipse across the round flat top,
+  near arc to the south (`stump_cap` names the ellipse's drawn height),
+  so the rings ride the round part in perspective.
+
 - **Flowers stand up, and keep swaying.** The animated meadow tile
   ($03, the one tile the overworld animates by frame rewrite) now
   renders as a billboard one voxel deep: the drawing's darkest tones