Docs/cleanup: refresh CONTEXT, update ISurface status, remove dead code

- rewrite CONTEXT.md for the current architecture, interfaces, netvars,
  menu tree, bones/ESP, aimbot/vischeck, triggerbot, silent aim and ABH
- update ISURFACE_STATUS.md: DrawLine slot, current menu/config path,
  9 build TUs, current file layout
- remove the stale root-level `tree` file
- drop unused class_health_off/per-class health scan (NPC HP is not
  networked), surf_call_slot, and unused scancode helpers

1 files changed, 0 insertions, 5 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index a08f029..37c849f 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -168,7 +168,6 @@ void fix_verified_crc(int seq, uint32_t crc);
 uint32_t usercmd_checksum(const CUserCmd *c);
 bool find_input_global();
 void resolve_netvars();
-int class_health_off(const char *name);
 bool resolve_server_netvars();
 int server_entity_health(int idx, int *maxhealth, int *lifestate, void **base_out);
 int server_model_index(void *base);
@@ -203,10 +202,6 @@ bool head_position(int idx, Vector &out);
 int aim_points(int idx, unsigned group_mask, Vector *out, int max);
 
 void outer_draw();
-// raw ISurface slot calls used by the PaintTraverseEx hook (hl2h.cpp)
-using SurfFn = void (*)(void *, ...);
-long surf_call_slot(void *surf, int slot, long a1 = 0, long a2 = 0);
-
 // ISurface pointer (defined in menu.cpp, used for drawing tests)
 struct ISurface;
 extern ISurface *g_surface;