Migrate the DECLS of the 7 identity-#foreign feature tests to extern/export
(1205-global/-helper, 1207, 1218-cvariadic, 1219, 1306, 1318): fn/global markers →
extern, the 2 objc import classes (1306/1318) → postfix '#objc_class("X") extern {'.
Behavior-preserving (A→B gate + existing extern twins guarantee identical output);
empty snapshot diff, corpus-validated. Comment-only #foreign in these files is left
for the Phase 9.3 doc/comment purge (comments aren't parsed → not cutover-critical).
Suite green (647 corpus / 444 unit, 0 failed).
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1.3 KiB