Standardise estate UUID usage on UUID v7

[arena-ai-coding-agent]

Summary

• Establishes UUID v7 as the binding identifier standard for the hyperpolymath and metadatastician estates.
• Migrates non-v7 UUID literals found in the standards repository.
• Adds a portable UUID v7 validator and local dogfood workflow.
• Adds governance-reusable CI enforcement for caller repositories.
• Adds Hypatia rule HYP-UUID-001 and fleet audit tooling.
• Defines migration, compatibility-alias, rollback, and no-silent-fallback requirements.

Validation

• scripts/check-uuid-v7.sh .
• git diff --check

Scope note

The central enforcement and migration standard are implemented here. The PR does not claim that all remote estate repositories have already completed their datastore and workflow-pin migrations; those require the estate rollout using the new controls.

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