fix(client): address PR #13 review — LOS tests, reset consistency, docs

- Use reset_test_state() consistently in test_snapshot_parsing.gd (Tyre critical)
- Fix misleading wall comment: (12,9) → (12,10) (Hoshe warning)
- Add coordinate space documentation to _test_snapshot() (Tyre warning)
- Add 4 Bresenham LOS unit tests: clear, blocked, diagonal, self (Hoshe warning)
- Check OS.is_process_running() in connection loop (Hoshe warning)
- Verify NPC position in corner reveal test (Hoshe suggestion)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/scripts/autoloads/sim_bridge.gd

@@ -250,6 +250,10 @@ static func _action_enum_to_wire(action: int) -> String:
 
 # Dynamic test snapshot — processes queued inputs to move player, generates
 # visibility based on current position. Matches Protocol.decode_snapshot() format.
+# NOTE: Test coordinate space (player at 10,10; NPC at 12,9; wall at 12,10)
+# is intentionally decoupled from the E2E proof room (player at 16,16; NPC at
+# 16,13; wall at 16,14). This ensures standalone tests don't depend on server
+# map layout and can exercise the rendering pipeline independently.
 func _test_snapshot() -> Dictionary:
 	_test_tick += 1
 
@@ -276,7 +280,7 @@ func _test_snapshot() -> Dictionary:
 		"visibility": "Forward",
 	}]
 
-	# NPC at (12, 9) — visible if within range and not blocked by wall at (12, 9)
+	# NPC at (12, 9) — visible if within range and not blocked by wall at (12, 10)
 	var npc_pos := Vector2i(12, 9)
 	var npc_dist := absi(px - npc_pos.x) + absi(py - npc_pos.y)
 	if npc_dist <= 4 and _test_has_los(Vector2i(px, py), npc_pos):