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davide b292590cdc docs: add docs-as-code process and one ADR per feature

docs/docs-as-code.md defines the workflow; docs/adr holds 31 ADRs
(retroactive, reconstructed from code and changelog) with a template and
index. docs/check-docs.sh validates ADR structure, index, cited code
paths, relative links and CLAUDE.md/AGENTS.md sync.

2026-11-03 09:45:51 +01:00

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0003. Layered architecture: Core knows nothing about the UI

Status: Accepted
Area: Architecture
Recorded: 2026-11-03 (retroactive: reconstructed from code, comments and changelog)

Context

The same wallet logic must be driven by a GUI, a CLI and headless tests. If cryptography or network code leaked into view code it could not be tested without a display and could not be audited in isolation.

Decision

Layers depend only downward: GUI → wallet domain → SPV/sync → network → cryptography → persistence. src/Core (Chain/ Crypto/ Wallet/ Spv/ Net/ Storage/) has no UI dependency. src/App and src/Cli depend only on Core; the UI reaches the network and cryptography exclusively through the wallet domain.

Consequences

dotnet test covers almost all behaviour headlessly.
The CLI is a second front end for free (0024).
Violations (e.g. a ViewModel opening a socket) are review blockers, not style issues.

References

src/Core
src/Cli/Program.cs

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