Introduce fakes and contract tests for AWS Lambda integration#763

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tooky wants to merge 10 commits intomainfrom

introduce-lambda-fakes-and-contracts

Commits on Apr 3, 2026

refactor: extract LambdaAPI interface from concrete *lambda.Client

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test: add LambdaAPI contract test suite against real AWS

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feat: add FakeLambdaClient that passes the LambdaAPI contract

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test: add fake-backed unit tests for Lambda filtering and pagination

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test: add fake-backed unit tests for Lambda orchestration

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test: trim Lambda integration tests to focused smoke tests

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chore: mark all Lambda fakes & contract slices complete in TODO

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feat: inject FakeLambdaClient into command tests via factory

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chore: mark Slice 7 complete in TODO

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docs: add TODO checklist for remaining cloud provider fakes

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