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018-hirst-painting/.claude/skills/artifact/references/SD.md
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Tirsvad 7c0ed0dcc5 Add the SQA and QC framework and project instructions
Mount the framework as a submodule at framework/ (v0.4.0), add AGENTS.md and
the installed skill copies for Codex CLI (.agents/skills) and Claude Code
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# Sequence Diagram (Design) (SD)
Cite in `CrossReference` only if the instance exists (`new-artifact.sh` checks this for you):
- **OC** — **Required source**: the contract whose postconditions each diagram realizes
- **DCD** — Forward: classes/methods these messages become
## Required sections (after Metadata / Version History)
One block per realized Operation Contract:
1. **Realizes** — the contract (`[OC-…]`) and its operation name.
2. **Diagram** — PlantUML sequence diagram: sync (solid filled arrow),
async (open arrow), returns (dashed); activations matching the call
nesting; `create` / `destroy` shown for transient objects;
`loop` / `alt` / `opt` fragments for conditional/repeated behavior.
3. **Pattern Annotations** — table `Pattern (GRASP/GoF) | Applied to |
Rationale`. Patterns are labelled, never implicit.
4. **Postcondition Coverage** — `Postcondition | Satisfied by message`;
every postcondition of the contract must be covered.
5. **Responsibility Check** — a short note showing no god-object receives
all messages (low coupling, high cohesion).
## Terminology
Use the IT terms from the dictionary (`DICT`), not the PO terms the Domain Model uses.