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, 5 insertions, 0 deletions

diff --git a/src/game/build_graph.cpp b/src/game/build_graph.cpp
index 2398b9c..b4c75d7 100644
--- a/src/game/build_graph.cpp
+++ b/src/game/build_graph.cpp
@@ -540,6 +540,11 @@ void BuildGraph::break_node(int node_id) {
 // Devices mounted on the strut graph
 // =============================================================================
 
+
+// NOTE: ClaimsStructures in Forts game data is a territory/team-claiming flag,
+// not a placement-legality rule. Do NOT add a strut-proximity placement gate
+// without new evidence. Every device snaps onto the nearest strut; unmounted
+// devices die only from weapon damage, which is acceptable.
 int BuildGraph::mount_device(int na, int nb, int device_type, int team, float hp) {
     if (na < 0 || na >= (int)nodes.size()) return -1;
     if (nb < 0 || nb >= (int)nodes.size()) return -1;