GUI: recover invalid fonts; vischeck: props and bulletproof glass

- Validate the GUI font handles with GetTextSize and recreate them when the
  local player entity or UI scale changes. Small scaled sizes fall back to the
  proven 16 px size, and the failure log/toast is emitted once instead of every
  frame. This fixes sessions where the menu rendered with no text after a
  level transition.
- Rework visibility: trace with MASK_SHOT/TRACE_EVERYTHING while ignoring the
  local player and target, so static props, crates and other NPCs block.
  Non-solid glass and breakable-glass materials are skipped; solid non-break
  glass (bulletproof) blocks. Fix CONTENTS_WINDOW 0x2 (was 0x4) in the masks.
- Pass self/target to is_visible from aimbot/silent/melee callers.

1 files changed, 9 insertions, 2 deletions

diff --git a/CONTEXT.md b/CONTEXT.md
index 5f27572..922ea98 100644
--- a/CONTEXT.md
+++ b/CONTEXT.md
@@ -288,10 +288,17 @@ vocabulary / decisions.
   mask. This caused active-weapon lookups to produce bogus indices after a
   map change once the weapon serial was nonzero (melee killbot looked dead).
 - `ISurface` binary slot = SDK header slot + 4; see `src/ISURFACE_STATUS.md`.
+- GUI font handles are validated with `GetTextSize` and recreated when the
+  local player entity or UI scale changes; if the scaled size fails, 16 px is
+  used as a fallback. VGUI can silently invalidate font handles across level
+  transitions.
 - Silent aim and ABH temporarily replace the usercmd view; silent aim preserves
   movement, ABH intentionally zeroes it for the jump tick.
-- Aimbot vischeck (`MASK_VISIBLE`/world-only) differs from triggerbot
-  (`MASK_SHOT`/all entities): glass and static props can behave differently.
+- Aimbot/silent/melee vischeck now traces everything bullets care about
+  (`MASK_SHOT`) while ignoring the local player and target. Static props,
+  crates and other NPCs block. Non-solid glass and breakable-glass materials
+  are skipped; solid non-break glass (bulletproof) blocks. Triggerbot still
+  uses the same `MASK_SHOT` trace and will not fire through glass.
 
 ## Valuable items