Add Pretty Table project: plan, accepted documents and code

Business Case, Stakeholder Analysis, Project Plan and milestone MIL-001
with review records RC-001 to RC-003, then the Python project: PrettyTable
Pokemon table, constants, pytest tests, pyproject.toml, Doxyfile, CI
workflow and README.

Task: MIL-001#1
Task: MIL-001#2
Task: MIL-001#3
Task: MIL-001#4
Task: MIL-001#5
Task: MIL-001#6
Task: MIL-001#7
Task: MIL-001#8

.claude/skills/artifact/templates/OC.md

@@ -0,0 +1,41 @@
+# @TITLE@
+
+## Metadata
+| Key | Value |
+| --- | --- |
+| ID | @ID@ |
+| CrossReference | @CROSSREF@ |
+
+## Version History
+| Date | Status | Author | Reviewer | Change | Commit |
+| --- | --- | --- | --- | --- | --- |
+| @DATE@ | Proposed | @AUTHOR@ | <reviewer S-ID> | Initial version | pending |
+
+---
+
+## Contract: <operationName>
+
+| Item | Value |
+| --- | --- |
+| Operation | `operationName(param: Type): ReturnType` |
+| Traces to | <SSD message> in [SSD-<n>] |
+| Domain Model concepts | <Concept, Association> ([DM-<n>]) |
+
+**Preconditions**
+
+- <required state in Domain Model terms>
+
+**Postconditions**
+
+- A <Concept> instance was created.
+- <Concept> was associated with <Concept>.
+- <Concept>.<attribute> was set to <value>.
+
+**Exceptions**
+
+| Condition (failing precondition) | Outcome |
+| --- | --- |
+
+---
+
+@LINKS@