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living-architecture

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Reference for the living-architecture layer (LikeC4 structure model + arc42 principles + model-truth import enforcement + cross-check) — its syntax, the checks, and how to maintain it alongside the /la:pr + OpenSpec flow. Building the first model is la:arch-init; carving a boundary is la:arch-cleanup.

plugin/skills/living-architecture/SKILL.md

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**Preflight:** run `la-doctor --plugin <this skill's base directory>` once per session before using any `la-*` or `dr-*` command; if it fails, stop and show the user its output.

# Living architecture

Four layers, one element id everywhere. Behaviour lives in OpenSpec; everything
cross-cutting lives here:

| Layer | Question | Artifact | Property |
|---|---|---|---|
| Behaviour | what does it do, now? | `openspec/specs/<id>/spec.md` | living, merged by OpenSpec |
| Structure | how is it arranged, now? | LikeC4 model + views | living; ONE model, diagrams are projected views |
| Rationale | why is it this way, and what must all code here obey? | arc42 file per element that earns prose | living, edited in place |
| Enforcement | is the code actually like this? | `arch_check` model-truth (the one import law) + LikeC4 model validation, run in the flow gates | executable, blocking |
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