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.
Adds ir-only x86_64 examples mirroring the aarch64 feature examples, so
each emit path is locked on both arches:
- 1657 read-write `+` → "incq ${0}", "=r,0" (tied input)
- 1658 indirect `=*m` → "movq $$42, ${0}", "=*m"(ptr elementtype i64)
- 1659 symbol `"s"` → "call ${2:P}", direct call to an exported sx fn
Each is x86-pinned (ir-only on this aarch64 host — the .ir is the
assertion; runs on x86_64-linux, main returns 0 on success / 1 if the
asm misbehaved). x86 templates validated by cross-emitting an object
(LLVM's integrated assembler accepts them; objdump confirms 1659 is a
direct `call` reloc to cb). Note: x86 direct calls need the `P` operand
modifier (`%[fn:P]`); aarch64 `bl %[fn]` needs none. Pure additive
locks, no compiler change. zig build test green (668 corpus, 446 unit).
