docs: ADR for tenant IDs

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Summary

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ADR-104: Add Architecture Decision Record for Tenant IDs

Documentation

📄 Added a new Architecture Decision Record (ADR-104) defining the specification and constraints for tenant IDs in the OpenKCM project.

Changes

• adr/tenant-id.md: New ADR document establishing tenant ID requirements, including:

  • Uniqueness & immutability: Tenant IDs must be globally unique and eternal (never reused)
  • Stability: IDs must remain stable across tenant moves
  • Format: Maximum 40 characters using URI unreserved characters (ALPHA / DIGIT / "-" / "." / "_" / "~")
  • Recommendation: Use lowercase UUID (RFC 4122 format), optionally prefixed with a short semantic string (e.g., kcm-658b416d-1f4a-41d9-b70c-59a2442b0724)

• adr/authors.yml: Added Chris Burkert as a contributor entry.

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[efrank-at-sap]

LGTM, thank you!