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/memory/expected/0800-memory-list.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0800-memory-list.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0800-memory-list.stdout

@@ -0,0 +1 @@
+List__i32{items: [*]i32@0xADDR, len: 5, cap: 8}

examples/memory/expected/0801-memory-slices.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0801-memory-slices.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0801-memory-slices.stdout

@@ -0,0 +1,9 @@
+arr.len = 5
+arr[1..4] = [1, 4, 1]
+sub.len = 3
+arr[..3] = [3, 1, 4]
+arr[2..] = [4, 1, 5]
+sl[1..4] = [20, 30, 40]
+mid[1..] = [30, 40]
+msg[6..11] = world
+msg[..5] = hello

examples/memory/expected/0802-memory-pointers.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0802-memory-pointers.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0802-memory-pointers.stdout

@@ -0,0 +1,5 @@
+before: Vec2{x: 1.000000, y: 2.000000}
+after: Vec2{x: 99.000000, y: 2.000000}
+copy: Vec2{x: 99.000000, y: 2.000000}
+mp[0] = 10
+mp[2] = 30

examples/memory/expected/0803-memory-push-context-with-arena.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0803-memory-push-context-with-arena.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0803-memory-push-context-with-arena.stdout

@@ -0,0 +1,2 @@
+inside push
+after push

examples/memory/expected/0804-memory-xx-target-in-field-assign.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0804-memory-xx-target-in-field-assign.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0804-memory-xx-target-in-field-assign.stdout

@@ -0,0 +1,2 @@
+dpi=2.000000
+delta=0.500000 fc.a=1.000000

examples/memory/expected/0805-memory-xx-userspace.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0805-memory-xx-userspace.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0805-memory-xx-userspace.stdout

@@ -0,0 +1 @@
+tag = 42

examples/memory/expected/0806-memory-static-method-inline-xx-protocol-arg.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0806-memory-static-method-inline-xx-protocol-arg.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0806-memory-static-method-inline-xx-protocol-arg.stdout

@@ -0,0 +1,3 @@
+Box.init (named-var):  ok
+make_box (inline-xx):  ok
+Box.init (inline-xx):  ok

examples/memory/expected/0807-memory-xx-recover-then-dispatch.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0807-memory-xx-recover-then-dispatch.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0807-memory-xx-recover-then-dispatch.stdout

@@ -0,0 +1,4 @@
+recovered == gpa? true
+alloc count after first alloc: 1
+recovered2 == gpa? true
+alloc count after dealloc: 0

examples/memory/expected/0808-memory-xx-value-routes-through-context-allocator.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0808-memory-xx-value-routes-through-context-allocator.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0808-memory-xx-value-routes-through-context-allocator.stdout

@@ -0,0 +1 @@
+Tracer.count = 1

examples/memory/expected/0809-memory-xx-lvalue-borrows.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0809-memory-xx-lvalue-borrows.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0809-memory-xx-lvalue-borrows.stdout

@@ -0,0 +1,2 @@
+alloc_count   = 1
+dealloc_count = 1

examples/memory/expected/0810-memory-slice-ptr.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0810-memory-slice-ptr.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0810-memory-slice-ptr.stdout

@@ -0,0 +1,3 @@
+=== 17. Slice Ptr ===
+sl-ptr[0]: 20
+sl-ptr[1]: 30

examples/memory/expected/0838-memory-helpers.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0838-memory-helpers.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0838-memory-helpers.stdout

@@ -0,0 +1,9 @@
+create: 7 42
+pipe-create: 1
+dot-create: 2
+alloc: 10 40 len=4
+clone: 10 (orig 99)
+resize: 20 60 len=6
+shrink: 99 20 len=2
+realloc: 1234
+TrackingAllocator: allocs=8 deallocs=8 outstanding=0 total_alloc_bytes=184

examples/memory/expected/0839-memory-bufalloc-by-value.exit

@@ -0,0 +1 @@
+0

examples/memory/expected/0839-memory-bufalloc-by-value.stderr

@@ -0,0 +1 @@
+

examples/memory/expected/0839-memory-bufalloc-by-value.stdout

@@ -0,0 +1,3 @@
+full capacity: true true pos=128
+over: true
+reset: 0