[client-python] feat(signature): first US for ExpectationSignature (#206)#257

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Kakudou wants to merge 13 commits into

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feat/us-int-1-signature-lifecycle

Commits on May 25, 2026

🧪 test(signatures): add Gherkin feature specs for SignatureManager
Kakudou
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🧪 test(signatures): add Gherkin constraint specs for SignatureManager
Kakudou
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🧪 test(signatures): add RED step definitions for SignatureManager
Kakudou
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🏷️ feat(signatures): extend SignatureTypes enum with cloud/external members
Kakudou
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🥅 feat(signatures): add SignatureTransmissionError exception
Kakudou
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✨ feat(signatures): add pydantic models for callback payload schema
Kakudou
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✨ feat(apis): add SignatureApiManager for callback transport
Kakudou
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✨ feat(signatures): implement SignatureManager lifecycle class
Kakudou
committed