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/json.bux

@@ -5,20 +5,20 @@ import Std::Fmt::{Fmt_Fmt1, Fmt_FmtInt};
 
 func Main() -> int {
     PrintLine("=== Json Demo ===");
-    
+
     let s: String = "{\"name\":\"Bux\",\"count\":42,\"items\":[\"a\",\"b\",\"c\"]}";
     let j: JsonValue = Json_Parse(s);
     PrintLine("Parsed and stringified:");
     PrintLine(Json_Stringify(j));
-    
+
     PrintLine("\nAccess fields:");
     PrintLine(Fmt_Fmt1("name = {0}", Json_AsString(Json_ObjectGet(j, "name"))));
     PrintLine(Fmt_FmtInt("count = {0}", Json_AsNumber(Json_ObjectGet(j, "count")) as int64));
-    
+
     let items: JsonValue = Json_ObjectGet(j, "items");
     PrintLine(Fmt_Fmt1("items[0] = {0}", Json_AsString(Json_ArrayGet(items, 0))));
     PrintLine(Fmt_Fmt1("items[1] = {0}", Json_AsString(Json_ArrayGet(items, 1))));
-    
+
     PrintLine("\nBuild JSON programmatically:");
     var obj: JsonValue = Json_Object();
     Json_ObjectSet(&obj, "lang", Json_String("Bux"));
@@ -28,6 +28,6 @@ func Main() -> int {
     Json_ArrayPush(&arr, Json_String("safe"));
     Json_ObjectSet(&obj, "tags", arr);
     PrintLine(Json_Stringify(obj));
-    
+
     return 0;
 }