feat: lifetime elision, tooling CI, registry, and LSP locals

Ship the QUALITY_PLAN stretch from ownership through ecosystem: C.1
lifetime elision (bootstrap + selfhost), bux fmt/test/doc CI hooks,
stdlib goldens, package registry (bux search/add), and LSP 0.4
position-sensitive locals with inferred let types. Full-tree format
pass plus Map/Set remove double-free fix.

examples/generic_infer.bux

@@ -13,14 +13,14 @@ func Main() -> int {
     // Inferred: T = int
     let m1: int = Max(10, 20);
     let m2: int = Max(5, 3);
-    
+
     PrintLine("Max(10, 20) = ");
     PrintInt(m1);
     PrintLine("");
-    
+
     PrintLine("Max(5, 3) = ");
     PrintInt(m2);
     PrintLine("");
-    
+
     return 0;
-}
+}