agra 9bde1dd590 refactor(ir): extract ObjcLowering (ffi_objc.zig) for pure Obj-C decision helpers (A6.1 step 2) ...

Move the pure Obj-C decision helpers out of lower.zig into src/ir/ffi_objc.zig
behind an ObjcLowering *Lowering facade (Principle 5, like the A4/A5 resolvers).
Behavior-preserving relocation — the only non-self.l rewrites are facade
plumbing.

Moved verbatim (self. -> self.l. for Lowering members):
- deriveObjcSelector (selector derivation)
- objcTypeEncodingFromSignature + appendObjcEncoding + bailObjcEncoding +
  the ObjcEncodingStack type
- objcPropertyKind + the ObjcPropertyKind enum
- isObjcClassPointer
- objcDefinedStateStructType + objcStateAllocatorType

Emission-heavy code stays in lower.zig per PLAN A6.1 step 6: emitObjc* IMP
builders, lowerObjc*Call, registerObjc*, declareObjc*, the lookupObjc* property/
state lookups, and the Self-substitution resolvers.

- Call sites rerouted through a new objc() accessor: 15 in lower.zig, 1 in
  expr_typer.zig, 39 in lower.test.zig (the A6.1 scaffolding tests now drive the
  facade). No Lowering wrappers kept. Barrel-wired ffi_objc + ObjcLowering.
- No new visibility widening beyond sub-step 1's two pubs — the facade reads
  self.l.{alloc,module,program_index,diagnostics} (fields) + the already-pub
  resolveType. lower.zig -478 (->16615); ffi_objc.zig 428.
- Doc-only re-home: the property-IMP getter/setter comment was attached (a
  pre-existing artifact) to the moving ObjcPropertyKind enum, two decls away from
  its real subject emitObjcDefinedClassPropertyImps (which had no doc). Re-homed
  it there so the move neither orphans a `///` block (Zig errors on a dangling doc
  comment) nor misattributes it to ensureArcRuntimeDecls.

Gate: zig build, zig build test, bash tests/run_examples.sh -> 361/0
(48 13xx Obj-C examples + 4 Obj-C .ir snapshots green, no churn).

2026-06-03 08:00:42 +03:00

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