test: failing regression test for #261: Rectangular pattern of a hole cut scales super-linearly (#276)

* test: reproduce #261 (Rectangular pattern of a hole cut scales super-linearly)

* Patterns of many hole cuts scale near-linearly (#261)

Two quadratic costs:
- Meshing a face tested every point against every segment of every boundary
  loop, so a plate face with hundreds of holes meshed in quadratic time. The
  vendored truck-meshalgo inside test now skips loops whose parameter box is
  clear of the point (they wind zero times around it).
- A pattern cut each copy in turn, rebuilding and re-checking an ever more
  complex target per copy. Copies whose boxes are clear of each other are now
  one tool of many pieces (kernel::union_apart, no intersection work), cut once.

512 holes now take ~7 s instead of not finishing. The test's volume tolerance is
widened from 1e-6 relative to 0.1 % of each hole: the measure meshes the bores
and reads each hole ~0.06 % small, on main too.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Hole-pattern test: a budget CI can meet; coarser apart-box meshes (#261)

CI runs every test binary at once and is about ten times slower than a
machine running this test alone (15 tests passed 60 s in the last run), so the
512-hole pattern (about 6 s alone) hit the 60 s timeout there. The budget now
only has to tell linear from the quadratic hang: 300 s timeout, 120 s budget.
union_apart meshes each copy coarsely (2 % of its size, box grown by twice that).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* Hole-pattern test checks the scaling, not a wall-clock time (#261)

CI runs every test binary at once: the 512-hole pattern (about 6 s alone, 10 s
CPU single-threaded) took 177 s there, so no fixed time is reliable. The test
now patterns 128 and then 512 holes and requires the second to take under 8x
the first (linear is 4x, measured 3.5-4.2x here; the old quadratic cost was 16x
or more), each with the volume check and a 900 s hang guard.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

Co-authored-by: bherbruck <brennen.herbruck@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/doc/src/eval.rs

@@ -2535,6 +2535,14 @@ fn replay(
                 }
             }
         }
+        // Many cut copies clear of each other: one tool of many pieces, so the target is cut
+        // once instead of rebuilding an ever more complex body for every copy (#261).
+        if op == Operation::Cut
+            && copies.len() >= 8
+            && let Ok(Some(one)) = kernel::union_apart(&copies)
+        {
+            copies = vec![one];
+        }
         // New bodies from a pattern join their source when they touch it (as one feature would).
         if f.body_names.is_empty() {
             apply_op(st, f, copies, op, &targets)?;