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/Os.bux

@@ -1,40 +1,40 @@
 module Std::Os {
 
-extern func bux_argc() -> int;
-extern func bux_argv(index: int) -> String;
-extern func bux_getenv(name: String) -> String;
-extern func bux_setenv(name: String, value: String) -> int;
-extern func bux_getcwd() -> String;
-extern func bux_chdir(path: String) -> int;
-extern func bux_exit(code: int);
+    extern func bux_argc() -> int;
+    extern func bux_argv(index: int) -> String;
+    extern func bux_getenv(name: String) -> String;
+    extern func bux_setenv(name: String, value: String) -> int;
+    extern func bux_getcwd() -> String;
+    extern func bux_chdir(path: String) -> int;
+    extern func bux_exit(code: int);
 
-func Os_ArgsCount() -> int {
-    return bux_argc();
-}
+    func Os_ArgsCount() -> int {
+        return bux_argc();
+    }
 
-func Os_Args(index: int) -> String {
-    return bux_argv(index);
-}
+    func Os_Args(index: int) -> String {
+        return bux_argv(index);
+    }
 
-func Os_GetEnv(name: String) -> String {
-    return bux_getenv(name);
-}
+    func Os_GetEnv(name: String) -> String {
+        return bux_getenv(name);
+    }
 
-func Os_SetEnv(name: String, value: String) -> bool {
-    return bux_setenv(name, value) == 0;
-}
+    func Os_SetEnv(name: String, value: String) -> bool {
+        return bux_setenv(name, value) == 0;
+    }
 
-func Os_GetCwd() -> String {
-    return bux_getcwd();
-}
+    func Os_GetCwd() -> String {
+        return bux_getcwd();
+    }
 
-func Os_Chdir(path: String) -> bool {
-    return bux_chdir(path) == 0;
-}
+    func Os_Chdir(path: String) -> bool {
+        return bux_chdir(path) == 0;
+    }
 
-/* Terminate the process with the given exit code */
-func Os_Exit(code: int) {
-    bux_exit(code);
-}
+    /* Terminate the process with the given exit code */
+    func Os_Exit(code: int) {
+        bux_exit(code);
+    }
 
 }