docs: define multi-repository scope across both estates

[arena-ai-coding-agent]

Summary

• Add a draft standard for declaring safe, reviewable scope for multi-repository bot tasks.
• Add a TOML example that names both the hyperpolymath and metadatastician estates without implying write authorization or claiming a live inventory.
• Link the standard from the README and AI manifest.
• Extend the ultraplan with a 2026-09-28 issue-triage addendum: current open-issue snapshot, priority buckets, evidence-based closure criteria, two-estate scope, and a staged read-only reconciliation workflow.

Validation

• TOML parsed with Python tomllib; verified both estate declarations are present.
• git diff --check passes.

No GitHub issues were edited or closed. The triage classifications are recommendations based on the current snapshot; issues must be revalidated before disposition.

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