Melee: surface weapon state across maps; reset stale caches

- Map transitions often leave a non-crowbar weapon active, so the killbot
  silently does nothing. Log every active-weapon change as a normal
  `melee: active ... crowbar=0/1` line and toast once suggesting the crowbar.
- Recover the crowbar model from the server entity when the client weapon
  model index is missing/0 after a map change.
- Clear the bone cache and aim/silent locks when the local player entity
  changes (map load/respawn) so stale entity/model data cannot poison melee
  target selection.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/bones.cpp b/src/bones.cpp
index 0df13f2..c777067 100644
--- a/src/bones.cpp
+++ b/src/bones.cpp
@@ -509,6 +509,19 @@ bool head_position(int idx, Vector &out) {
 // Collect world-space aim points for the selected hit groups (HITGROUP_*).
 // Group 1 (head) uses head_position for its bone fallback; other groups are
 // the hitbox centers. The caller picks the point nearest to the crosshair.
+void bones_clear() {
+  for (auto &e : g_entries) {
+    e.ent = nullptr;
+    e.valid = false;
+    e.hdr = nullptr;
+    e.count = 0;
+    e.stamp = 0.0;
+  }
+  g_next = 0;
+  g_logged = 0;
+  g_renderable_warned = false;
+}
+
 int aim_points(int idx, unsigned group_mask, Vector *out, int max) {
   if (!out || max <= 0)
     return 0;