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/0776-modules-bare-generic-static-method-visible-author/b.sx

@@ -0,0 +1,12 @@
+// The bare-VISIBLE author: a one-field generic `Box` (size 8) with its own
+// `make`. `b.sx` itself flat-imports `c.sx`, so a file that imports only b.sx
+// reaches `c.Box` at two hops and must NOT pick it (nor `c.Box.make`).
+Box :: struct($T: Type) {
+    x: T;
+
+    make :: (value: T) -> Box(T) {
+        .{ x = value }
+    }
+}
+
+#import "c.sx";

examples/modules/0776-modules-bare-generic-static-method-visible-author/c.sx

@@ -0,0 +1,13 @@
+// The NON-visible 2-flat-hop author: a two-field generic `Box` (size 16) with its
+// own `make` (sets a second field). Same template NAME as b's, different layout.
+// It wins the global last-wins `struct_template_map` (and the name-keyed
+// `Box.make`), so the static-method head in a file importing only b.sx must NOT
+// pick it.
+Box :: struct($T: Type) {
+    x: T;
+    y: T;
+
+    make :: (value: T) -> Box(T) {
+        .{ x = value, y = value + 100 }
+    }
+}