fix: support signal model mock bindings #10942

[satanTime]

Summary

• read signal-model inputs and outputs from Angular ng defs when building mock metadata
• normalize synthetic model outputs so mocks expose the expected ...Change emitter
• add regression coverage for the parsing logic and the compiled Angular reproduction

Closes #10942

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Coverage        ?   100.00%           
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  Files           ?       228           
  Lines           ?      4185           
  Branches        ?      1194           
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  Hits            ?      4185           
  Misses          ?         0           
  Partials        ?         0           

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