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/0782-modules-bare-generic-instance-ambiguous-authors.sx

@@ -0,0 +1,18 @@
+// A BARE generic static-method head `Box(i64).make(7)` whose name has ≥2 DISTINCT
+// directly-visible (1-hop flat) same-name authors is AMBIGUOUS — the head must
+// diagnose the ambiguity (consistent with the leaf / 0755 / 0767) BEFORE any
+// instantiation or method lookup, never silently pick a global last-wins author.
+//
+// `p.sx` and `q.sx` each author a generic `Box($T)` and are BOTH flat-imported
+// here, so a bare `Box` reference has two visible authors and cannot be resolved
+// without qualification. The fix is to `p.Box(i64)` / `q.Box(i64)` (0779).
+
+#import "modules/std.sx";
+#import "0782-modules-bare-generic-instance-ambiguous-authors/p.sx";
+#import "0782-modules-bare-generic-instance-ambiguous-authors/q.sx";
+
+main :: () -> i32 {
+    x := Box(i64).make(7);
+    print("{}\n", x.x);
+    0
+}