test: group examples into per-category folders

Move examples/*.sx and their expected/ snapshots into per-category
subfolders (examples/<category>/...). Folder = leading filename token,
with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus
runner and LSP sweep now discover each category's expected/ dir, while
issues/ stays flat. Example 1058's repo-root-relative companion import
is made file-relative. Path strings embedded in 164 snapshots were
regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.

examples/modules/0835-modules-same-name-global-vs-const-own.sx

@@ -0,0 +1,15 @@
+// A module's own scalar const `K` and another module's same-named ARRAY
+// GLOBAL (`K : [4]i64 = .[...]`) coexist: each module's bare `K` binds its
+// OWN author. The global registry is last-wins across modules, so without
+// source-aware selection a.sx's `K` read the array global's address.
+//
+// Regression (issue 0115): a.sx printed the array's address; h.sx's reads
+// stayed correct only by registration order.
+
+#import "modules/std.sx";
+#import "0835-modules-same-name-global-vs-const-own/a.sx";
+h :: #import "0835-modules-same-name-global-vs-const-own/h.sx";
+
+main :: () {
+    print("a_k={} use_k={}\n", a_k(), h.use_k());
+}