Add use case model, ADR-0001, dictionary update and reviews RC-011 to RC-023

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docs/use-case-diagram.md

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+# Use Case Diagram
+
+## Metadata
+| Key | Value |
+| --- | --- |
+| ID | UCD-001 |
+| CrossReference | [SA-001], [BC-001] |
+| Language | en |
+| Domain | it |
+
+## Version History
+| Date | Status | Author | Reviewer | Change | Commit |
+| --- | --- | --- | --- | --- | --- |
+| 2026-10-13 | Accepted | Jens Tirsvad Nielsen | AI as stand-in for S01 | Initial version | pending |
+
+---
+
+## Purpose and Scope
+
+The system is the squirrel census program. The boundary contains the one goal of the assignment: counting squirrels by fur colour from the census file and writing the summary. The participant is the only actor.
+
+## Diagram
+
+```plantuml
+@startuml
+left to right direction
+actor "Participant" as A1
+rectangle "Squirrel Census Program" {
+  usecase "Count squirrels by fur colour" as UC1
+}
+A1 --> UC1
+@enduml
+```
+
+## Actor Table
+
+| Actor | Stereotype | Stakeholder ID (SA) | Goals (use cases) |
+| --- | --- | --- | --- |
+| Participant | <<Actor>> | S01, S02 | Count squirrels by fur colour |
+| Squirrel Census Program | <<System>> | S01 | - |
+
+## Use Case Table
+
+| Use Case | Actor(s) | Goal |
+| --- | --- | --- |
+| Count squirrels by fur colour | Participant | Get the number of squirrels of each fur colour as a summary file |
+
+## Relationships
+
+| From | Relationship (`<<include>>` / `<<extend>>`) | To | Justification |
+| --- | --- | --- | --- |
+| - | - | - | There is only one use case, so there is no include or extend relationship |
+
+---
+
+[SA-001]: ./stakeholder-analysis.md
+[BC-001]: ./business-case.md