docs: add operator competency record template

[Hinotoi-agent]

Summary

• Adds an informative Operator Competency Record Template appendix
• Links the template from the standard appendix index, Getting Started document map, and Human Oversight guidance
• Provides YAML and JSON-equivalent examples for tracking operator authorization, training, assessment, remediation, mentoring, and succession evidence

Why

APTS-HO-018 already covers operator qualification, training, competency governance, annual assessment, remediation, mentoring, and succession planning. This PR adds a practical evidence artifact that helps operators, customers, and reviewers inspect those records consistently without creating a new normative requirement.

Affected sections

• standard/appendix/Operator_Competency_Record_Template.md
• standard/README.md
• standard/Getting_Started.md
• standard/3_Human_Oversight/README.md
• standard/3_Human_Oversight/Implementation_Guide.md

Contributing.md checklist

• No overlapping open issue or PR was found for this specific operator competency record template
• Affected sections and requirement IDs are listed above
• Formatting and links were checked locally
• This contribution is informative/non-normative and does not create or modify APTS requirements
• Drafted with AI assistance and reviewed for accuracy, consistency with the standard, and style-guide compliance

Validation

• python3 scripts/validate_markdown_tables.py
• python3 scripts/check_internal_markdown_links.py
• python3 scripts/validate_cross_references.py
• python3 scripts/check_generated_artifacts.py
• python3 scripts/validate_yaml.py
• YAML example parsed with PyYAML
• Touched relative Markdown links verified locally
• git diff --check