docs: add current issue triage ultraplan

[arena-ai-coding-agent]

Summary

• Add a dated, complete inventory of the 199 open issues as of 2026-09-29.
• Carry forward the prior curated dispositions transparently and assign first-pass buckets to the eight newer items.
• Sequence safe close candidates, active reproductions, owner rulings, issue splits/merges, scope labeling, and evidence-based closure.
• Record that issue-write operations are blocked by the current integration's 403 rather than claiming any remote triage was applied.

Validation

• Verified the inventory contains exactly 199 unique issue links matching the live open-issue API snapshot.
• git diff --check passes.

See ULTRAPLAN-2026-09-29.adoc for the complete list and plan.

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