Separate method implementations: `procedure TFoo.Bar(...)` can now appear
outside the class definition. Parser detects qualified names in ParseMethodDecl
and makes the body optional for forward-only class declarations. Semantic pass
links standalone bodies back to class method declarations via LinkClassMethodImpls
before AnalyseMethodBodies runs, so all existing method analysis and codegen paths
are reused unchanged.
Free built-in: `Obj.Free` with no user-defined Free method emits `call $free(l ptr)`.
Semantic pass recognises the call and sets ResolvedMethod := nil as a signal;
codegen handles nil method as a built-in free before the normal dispatch path.
Phase 2 milestone verified: a linked list using TNode (TObject subclass) with
separate method impls, Create, and Free compiles and runs with zero valgrind errors
(3 allocs, 3 frees, 0 bytes in use at exit).
Design doc updated: new rows for is/as, ARC exception cleanup, separate method
impls, and Free built-in; Immediate Next Steps trimmed to macOS ARM64 only.
469 tests, 0 failures.
5840346a98