Jumpbug: optional velocity-timed assist

The unduck window is only 2 units, while a 625-ups fall moves ~9.3 units per
66.7 Hz movement command, so pure jumpbug is ~20% reliable at that speed.

- Add Jumpbug -> Assist timing (default off). When the natural next command
  would skip [36,38], pin the post-command ducked distance to 37 by writing
  the vertical velocity for that command. Pure jumpbug remains available with
  the option off.
- Resolve the client local m_vecAbsVelocity (0x11C) via the client datamap
  and the server m_vecAbsVelocity (0x228) via the server datamap.
- Write both the authoritative server velocity (what SetupMove reads through
  GetAbsVelocity) and the local prediction fields, so the next CreateMove sees
  the assisted origin on both sides.
- Do not write the server m_vecVelocity directly: the datamap scan finds two
  same-named entries (0x1C and 0x29C); SetAbsVelocity syncs it after movement.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index 92ae3f1..08eb2ef 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -81,6 +81,7 @@ struct NetVars {
   int maxs = -1;
   int lifestate = -1;
   int modelindex = -1;
+  int absvelocity = -1; // client C_BaseEntity::m_vecAbsVelocity (prediction)
   // ponytail: mins/maxs may be absent from some HL2 netvar tables; esp.cpp falls back to h=72
   bool ok() const { return flags >= 0 && velocity >= 0 && movetype >= 0; }
   // ponytail: m_iMaxHealth isn't a netvar in HL2 SP; esp.cpp falls back to 100.
@@ -177,6 +178,7 @@ bool find_input_global();
 void resolve_netvars();
 bool resolve_server_netvars();
 int server_entity_health(int idx, int *maxhealth, int *lifestate, void **base_out);
+bool server_set_velocity_z(int idx, float vz);
 int server_model_index(void *base);
 void find_modules();
 void init_conmsg();
@@ -185,6 +187,7 @@ bool feature_has_bind(int feature);
 bool feature_bind_held(int feature);
 bool esp_option(int opt);
 bool bhop_autostrafe_enabled();
+bool jumpbug_assist_enabled();
 unsigned aimbot_bone_mask();
 int aimbot_smooth_step();
 bool aimbot_vischeck_enabled();