Add Cut Test map; document ClaimsStructures is not a placement gateHEADswarm/devices-on-strut-graph

- New map entry in data/maps.lua: "Cut Test" — a narrow 2-wide X-braced
  tower with a reactor on top, for testing the mount-radius / collapse
  victory mechanic.
- Comment in build_graph.cpp documenting that ClaimsStructures in Forts
  game data is a territory-claiming flag, not a placement-legality rule.
- Update CLAUDE.md M5 status to done: devices on strut graph, fire
  damages devices.

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

1 files changed, 44 insertions, 0 deletions

diff --git a/data/maps.lua b/data/maps.lua
index d49d9e6..3822efb 100644
--- a/data/maps.lua
+++ b/data/maps.lua
@@ -189,6 +189,50 @@ table.insert(Maps, {
     },
 })
 
+-- 4. A narrow 2-wide X-braced tower with a reactor perched on top. Shoot the
+--    struts and the reactor falls when its supports are cut — the mount-radius
+--    mechanic in its simplest form. Both bays are fully cross-braced; cut both
+--    diagonals in one bay to un-triangulate it and watch the tower hinge.
+table.insert(Maps, {
+    name = "Cut Test",
+    description = "Narrow X-braced tower with a reactor on top. "
+               .. "Cut both diagonals in one bay to hinge it — "
+               .. "the reactor falls when its supports give way.",
+    ground_level = 1.0,
+    deposits = { {-26, 1}, {26, 1} },
+    devices = {
+        { type = "reactor", x = -22, y = 2.0, team = 0 },
+        { type = "reactor", x = -15, y = 5.0, team = 1 },
+    },
+    weapons = {
+        { type = "cannon", x = -22, y = 2.6 },
+        { type = "laser",  x = -19, y = 2.6 },
+    },
+    structures = {
+        {
+            name = "player deck",   -- small platform, anchors the player reactor
+            beams = {
+                {-24,1,-24,2,"wood"}, {-20,1,-20,2,"wood"},
+                {-24,1,-20,1,"wood"}, {-24,2,-20,2,"wood"},
+                {-24,1,-20,2,"wood"},
+            },
+        },
+        {
+            name = "test tower",    -- the thing to shoot at
+            beams = {
+                -- verticals
+                {-16,1,-16,3,"wood"}, {-14,1,-14,3,"wood"},
+                {-16,3,-16,5,"wood"}, {-14,3,-14,5,"wood"},
+                -- floors
+                {-16,1,-14,1,"wood"}, {-16,3,-14,3,"wood"}, {-16,5,-14,5,"wood"},
+                -- diagonals (cut both in one bay to un-triangulate the tower)
+                {-16,1,-14,3,"wood"}, {-14,1,-16,3,"wood"},
+                {-16,3,-14,5,"wood"}, {-14,3,-16,5,"wood"},
+            },
+        },
+    },
+})
+
 function IndexOfMap(name)
     for i, m in ipairs(Maps) do if m.name == name then return i end end
     return nil