Runtime-entry alias STITCHING implemented; the dispatch-miss feedback loop compounds again

Implementation simplification discovered during design: the F129 alias decode RE-SYNCHRONIZES with the natural alignment within a few instructions ($1159: ORA $85 consumes 2 bytes, $115B: ORA ($EA),Y consumes 2, landing on $115D which the natural pool already owns) — so full standalone alias functions are unnecessary. The fix is entry STITCHING: in engine.py's F8 multi-bank block (inside the console_id==atari2600 + Atari2600Mapper.is_banked gate —…

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