Lucien Cartier-Tilet ffcff82d20 feat(domain): implement RelayState enum with serialization support ...

Add RelayState enum to domain layer with:
- Display, Debug, Clone, Copy, PartialEq, Eq derives
- serde Serialize/Deserialize traits for API JSON handling
- Type-safe representation of relay on/off states

TDD green phase: Tests from T019 now pass.

Ref: T020 (specs/001-modbus-relay-control/tasks.md)

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..

001-modbus-relay-control

feat(domain): implement RelayState enum with serialization support

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templates

docs: add project specs and documentation for Modbus relay control

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constitution.md

docs: add project specs and documentation for Modbus relay control

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