#139: teach typos the CPY transition name

[RAprogramm]

Closes #139

_typos.toml already exempts FND; this adds CPY beside it, in the same shape and with the same kind of comment. Two lines.

The dictionary in typos 1.48.0 reports CPY as a misspelling of COPY or CPU, six times across src/perf.rs, src/emu/transitions.rs and src/emu/tests.rs. Every one of them is the deliberate three-letter transition code, just like FND, PPG, DLG and DEL.

This is what currently keeps #132 red: that pull request upgrades the action from 1.38.1 to 1.48.0, every other check on it passes, and typos fails for this reason alone. With this merged, that upgrade goes green.

Verified by running typos 1.48.0 over the whole repository on this branch: no findings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.09%. Comparing base (6025413) to head (f3f7365).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #140   +/-   ##
=======================================
  Coverage   94.09%   94.09%           
=======================================
  Files          14       14           
  Lines         711      711           
=======================================
  Hits          669      669           
  Misses         42       42           

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