Fix overlay-vanishing projections; ammo rule via held weapons

- world_to_screen now rejects NaN/inf and absurd projections. A point on the
  view axis (directly below the feet) could produce NaN and corrupt the
  ISurface clip state, hiding the whole ESP for that frame.
- Draw projectile radius rings even when the projectile centre is off-screen
  or behind the camera.
- Owner netvars are -1 on this client, so the "owned weapon -> ammo" rule now
  accumulates the weapon types the player has actually held (active weapon,
  server fallback), reset when the local entity changes.

1 files changed, 14 insertions, 4 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index d8fdb97..2cec0ad 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -228,6 +228,14 @@ vocabulary / decisions.
   a chevron clamped to a 26 px margin; behind-the-camera targets use the
   dot product with the view right vector. Toggle `ESP -> Off-screen arrows`
   (`arrows=1`).
+- `world_to_screen` rejects non-finite projections and absurd magnitudes
+  (>1e7). A point on the view axis (e.g. directly below the player's feet)
+  can make `IVDebugOverlay::ScreenPosition` return NaN/huge values; casting
+  those to int corrupted the ISurface clip state and made the whole overlay
+  disappear for that frame.
+- Projectile radius rings are drawn independently of the centre marker, so a
+  grenade behind the camera/off-screen still shows its blast circle when any
+  part of the ring projects.
 - Map transitions: see below.
 
 ## Camera / display
@@ -595,10 +603,12 @@ vocabulary / decisions.
   HL2 `MAX_NORMAL_BATTERY` cap of 100, read from the server
   `m_ArmorValue`. If the values cannot be read the filter fails open.
 - A world weapon whose type is already in the local player's inventory is
-  reclassified as ammo (`SMG ammo`, `AR2 ammo`, ...). Inventory types come
-  from client weapon entities whose owner handle resolves to the local player
-  index; NPC-held weapons are ignored. Weapons the player does not own stay
-  under the Weapons category.
+  reclassified as ammo (`SMG ammo`, `AR2 ammo`, ...). Owner handles are
+  unreliable on this client (`m_hOwnerEntity`/`m_hOwner` resolve to -1), so
+  the inventory mask is accumulated from every weapon type the player has
+  held (client `m_hActiveWeapon`, with the server handle as fallback) since
+  the current local entity appeared. NPC-held weapons are therefore ignored.
+  Weapons the player does not own stay under the Weapons category.
 - Scans the client entity list every 100 ms and tags health, ammo, armor/suit,
   world weapon pickups, the two supply-crate models and generic items.
 - Each tag is a colored marker with a name and optional distance, filtered by