feat(sdk): add local/cloud backend abstraction#754

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appcypher/sdk-local-cloud-backend

Commits on May 18, 2026

feat(sdk): add local/cloud backend abstraction
appcypher
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chore(sdk): strip plan-ID annotations from code
appcypher
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refactor(sdk): route sandbox handles through Backend trait (D6.4)
appcypher
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refactor(sdk): route volume handles through VolumeBackend trait (D6.4)
appcypher
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refactor(sdk): absorb GlobalConfig + DB pool into LocalBackend (D6.7)
appcypher
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fix(sdk): reject cloud-unsupported config fields + preserve cloud status
appcypher
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fix(sdk): symmetric trait signatures — backend Arc on every lifecycle method
appcypher
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