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/BPMN.md

@@ -0,0 +1,43 @@
+# @TITLE@
+
+## Metadata
+| Key | Value |
+| --- | --- |
+| ID | @ID@ |
+| CrossReference | @CROSSREF@ |
+| Language | @LANGUAGE@ |
+| Domain | @DOMAIN@ |
+
+## Version History
+| Date | Status | Author | Reviewer | Change | Commit |
+| --- | --- | --- | --- | --- | --- |
+| @DATE@ | Proposed | @AUTHOR@ | <reviewer S-ID> | Initial version | pending |
+
+---
+
+## Purpose and Business Goal
+
+Realizes: <Business Case objective> ([BC-<n>])
+
+## Participants
+
+| Pool / Lane | Participant | Stakeholder ID (SA) |
+| --- | --- | --- |
+
+## Process Diagram
+
+<image, or link to the BPMN 2.0 diagram file + its source>
+
+## Element Table
+
+| Element | Type (event / activity / gateway) | Lane | Description |
+| --- | --- | --- | --- |
+
+## Path Coverage
+
+| Path | Start event | End event |
+| --- | --- | --- |
+
+---
+
+@LINKS@