docs(adr): attendee check-in/check-out audit log

[romanetar]

Summary

• Adds ADR-005 (adr/005-attendee-check-in-audit-log.md) for the attendee check-in/check-out audit log.
• Records the decisions: append-only table written from explicit call sites, admin-UI-only check-out, nullable member + client id as actor, no purge, log on create-with-check-in, endpoint authz groups.
• Reassignment lock change is split into its own sub-ticket.

ClickUp: https://app.clickup.com/t/86bccdn3w
Sub-ticket (reassignment lock): https://app.clickup.com/t/86bcdp4r2

Docs only, no code changes.

[coderabbitai]

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[github-actions]

📘 OpenAPI / Swagger preview

➡️ https://OpenStackweb.github.io/summit-api/openapi/pr-618/

This page is automatically updated on each push to this PR.

[github-actions]

📘 OpenAPI / Swagger preview

➡️ https://OpenStackweb.github.io/summit-api/openapi/pr-618/

This page is automatically updated on each push to this PR.

[romanetar]

Superseded by #619 (branch renamed to feat/attendee-check-in-audit-log).