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/0789-modules-same-name-const-leaf-author-pin.sx

@@ -0,0 +1,22 @@
+// issue 0105 / F1 — a UNIQUE expression const's nested leaf folds against the
+// const's AUTHOR source, not the reading module's. `a.sx` declares `M :: 1` and
+// `K :: M + 1` (= 2); `b.sx` declares a DIFFERENT same-name `M :: 10` (no `K`).
+// `main` flat-imports both, so the reader sees two `M`s — but it reads only `K`,
+// which is unique to `a.sx`. Folding `K`'s RHS must pin `M` to A's source (→ 1),
+// giving `K = 2`, coherently whether `K` is read as a runtime VALUE (`print K`)
+// or used as an array DIMENSION (`[K]u8`) → val=2 len=2. Without the author pin
+// the nested leaf would re-select `M` from `main`'s view (two `M`s → ambiguous /
+// non-const dimension).
+#import "modules/std.sx";
+#import "0789-modules-same-name-const-leaf-author-pin/a.sx";
+#import "0789-modules-same-name-const-leaf-author-pin/b.sx";
+
+read_dim :: () -> i64 {
+    arr : [K]u8 = ---;
+    return arr.len;
+}
+
+main :: () -> i32 {
+    print("val={} len={}\n", K, read_dim());
+    0
+}