6d258ad82b
`appendObjcEncoding` previously bailed on `.@"struct"`, which blocked
sx-defined `#objc_class` methods from declaring CGPoint / CGRect /
NSRange-shape signatures — the `class_addMethod` registration path
would emit a "type kind not yet supported by Obj-C encoding"
diagnostic. The helper now emits Apple's `{Name=field0field1...}`
form recursively, with a small `ObjcEncodingStack` (cap 16) that
breaks transitive struct→struct cycles by emitting the abbreviated
`{Name}` form instead of recursing forever.
`{Point=dd}`, `{_NSRange=QQ}`, `{CGRect={CGPoint=dd}{CGSize=dd}}`
all flow through the existing `objc_msg_send` + `class_addMethod`
path with no further plumbing.
Tests:
- `lower.test.zig` gains four cases: optional unwrap (single + nested),
flat struct (CGPoint, NSRange shape), nested struct (CGRect with
CGPoint+CGSize), bringing the helper's test coverage from
primitives + pointers to the full encoding table.
- `examples/ffi-objc-defined-class-02-struct-encoding.sx` exercises
a sx-defined `SxMover` class with `goto(p: Point)` setter and
`here() -> Point` getter end-to-end on macOS; the IR snapshot
confirms `v@:{Point=dd}` and `{Point=dd}@:` land in
`OBJC_METH_VAR_TYPE_` constants wired to `class_addMethod`.
Checkpoint cleanup: the "Next step (M1.2 A.1 — type-encoding
derivation table)" header in CHECKPOINT-FFI.md was stale (A.1
shipped in 6cc016c; A.0–A.7 all done; commit list now linked).
The encoding table stays as reference material.
224/224 example tests pass; zig build test green.
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