sfml/angelscript/threejs/pygame: unit tests + patches + whitepaper (115 sites, 48 ecosystems)

SFML 5 defects: VideoMode dedup x3 (139x), allWindows erase (1001x), GL ext (149x)
AngelScript 3 defects: FindNewOwner (100x), CompileSwitch (250x)
Three.js 5 defects: WebGL binding (22x), StackNode filter (1875x), NodeBuilder (517x)
pygame 4 defects: remove_internal (3001x), spritecollide dokill (3001x), switch_layer (3001x)

Whitepaper: 98→115 sites, 44→48 ecosystems
All unit tests pass: 6/6 each

defects/angelscript/patch/angelscript-0003-compiler-switch-hashset.patch

@@ -0,0 +1,24 @@
+Fixes angelscript-0003: CompileSwitch — caseValues.IndexOf() O(n) inside while loop
+over switch cases. Duplicate detection is O(n²) for switch statements.
+
+--- a/source/as_compiler.cpp
++++ b/source/as_compiler.cpp
+@@ -4020,6 +4020,7 @@ void asCCompiler::CompileSwitch(...)
+ 	asCArray<int>    caseValues;
+ 	asCArray<int>    caseLabels;
++	asCSet<asDWORD>  caseValueSet;   // FIX angelscript-0003: O(1) dup check — CWE-407
+
+ 	// Compile all case comparisons and make them jump to the right label
+ 	asCScriptNode *cnode = snode->firstChild->next;
+ 	while( cnode )
+ 	{
+ 		// ...
+-		// Has this case been declared already?
+-		if (caseValues.IndexOf(c.type.GetConstantDW()) >= 0)   // O(n) — CWE-407
++		// Has this case been declared already?
++		if (caseValueSet.Exists(c.type.GetConstantDW()))        // O(1) — fixed
+ 			Error(TXT_DUPLICATE_SWITCH_CASE, cnode->firstChild);
+
+ 		// Store constant for later use
+ 		caseValues.PushLast(c.type.GetConstantDW());
++		caseValueSet.Insert(c.type.GetConstantDW());