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.

lib/Path.bux

@@ -1,19 +1,19 @@
 module Std::Path {
 
-extern func bux_path_join(a: String, b: String) -> String;
-extern func bux_path_parent(path: String) -> String;
-extern func bux_path_ext(path: String) -> String;
+    extern func bux_path_join(a: String, b: String) -> String;
+    extern func bux_path_parent(path: String) -> String;
+    extern func bux_path_ext(path: String) -> String;
+
+    func Path_Join(a: String, b: String) -> String {
+        return bux_path_join(a, b);
+    }
+
+    func Path_Parent(path: String) -> String {
+        return bux_path_parent(path);
+    }
+
+    func Path_Ext(path: String) -> String {
+        return bux_path_ext(path);
+    }
 
-func Path_Join(a: String, b: String) -> String {
-    return bux_path_join(a, b);
 }
-
-func Path_Parent(path: String) -> String {
-    return bux_path_parent(path);
-}
-
-func Path_Ext(path: String) -> String {
-    return bux_path_ext(path);
-}
-
-}