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/0813-modules-same-name-error-set-lambda-own-wins.sx

@@ -0,0 +1,30 @@
+// E6b — own-wins for an ERROR-SET name in a CLOSURE-LITERAL return annotation
+// (`closure(() -> !IoErr { … })`). `main` flat-imports `dep.sx` (which authors
+// `IoErr { Net }`) AND authors its OWN `IoErr { Disk }`. The closure literal's
+// `-> !IoErr` channel must resolve to `main`'s OWN author (own-wins), so the
+// `raise error.Disk` inside the closure body validates against main's `{ Disk }`;
+// meanwhile `dep_err` keeps dep's DISTINCT `IoErr { Net }`.
+//
+// Fail-before (attempt-1): `lowerLambda` resolved the explicit `lam.return_type`
+// through the STATELESS `type_bridge.resolveAstType`, so the closure's `!IoErr`
+// channel bound the global last-wins author (dep's `{ Net }`); `error.Disk` was
+// then "not in error set 'IoErr'" and the program exited 1.
+//
+// Pass-after: the lambda return annotation routes through the source-aware
+// `resolveTypeWithBindings` (same path as the regular function-return channel),
+// main's own `IoErr` wins, `error.Disk` validates, exit 0.
+
+#import "modules/std.sx";
+#import "0813-modules-same-name-error-set-lambda-own-wins/dep.sx";
+
+IoErr :: error { Disk }
+
+main :: () -> i32 {
+    fail_own := closure(() -> !IoErr { raise error.Disk; });
+    fail_own() catch (e) {
+        if e == error.Disk { print("own=Disk\n"); }
+    };
+    d := dep_err();
+    print("dep={}\n", d);
+    return 0;
+}