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/0786-modules-same-name-const-own.sx

@@ -0,0 +1,14 @@
+// issue 0105 / F2 — same-name VALUE const, own-wins. Two flat-imported modules
+// each declare a top-level `K` with a different value and a function that reads
+// `K` bare. Each function's OWN reference must bind ITS OWN module's `K`
+// (own-wins), exactly as same-name structs (0754) and functions (0722) do —
+// NOT the global last-wins author: `a_k` returns 1 and `b_k` returns 2,
+// resolved by the source-aware const author selector (`selectModuleConst`).
+#import "modules/std.sx";
+#import "0786-modules-same-name-const-own/a.sx";
+#import "0786-modules-same-name-const-own/b.sx";
+
+main :: () -> i32 {
+    print("a={} b={}\n", a_k(), b_k());
+    0
+}