docs: defer authorization implication semantics

[mariajgrimaldi]

Description

Permission implication and role inheritance can reduce repetition, but they also change how access is calculated and introduce questions about scopes, cycles, conflicts, API responses, and security testing. The current extensibility use cases do not require either feature because roles can list their permissions directly.

This ADR keeps the first schema version explicit: every role lists each assigned permission. It leaves room for implication or inheritance in a later schema version once there is an agreed use case and the required behavior has been defined.

Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

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