Feature/csub implementation#28
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Implement CALLBACK keyword for SUB declarations that creates functions compatible with the Amiga Hook mechanism (utility.library CallHookPkt). Features: - CALLBACK SUBs receive parameters via registers A0, A2, A1 (Hook convention) - Automatic register save/restore (D1-D7/A0-A6) - Return value placed in D0 - Address obtained via @ operator for Hook.h_Entry Restrictions enforced: - Must have exactly 3 ADDRESS parameters (error 84) - Cannot be called directly from ACE code (error 85) Files changed: - Compiler: acedef.h, lex.c, lexvar.c, parse.c, factor.c, statement.c - Documentation: ace.txt, ref.txt - Tests: callback category and error tests added Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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