Decisions audit table — deferred upgrades

[jeevanpillay]

Follow-ups deliberately deferred from the decisions audit-table rework.

Context: full-width, day-grouped decisions audit table with keyset pagination, provider/status filtering, search, and inline row expansion. Shipped in 602f31019 (grouped detail layout) and the surrounding feature commits; plan at docs/superpowers/plans/2026-06-03-decisions-audit-table.md.

Deferred upgrades

• Live running rows — duration ticks up and flips to ✓/✗ in place without a manual refresh (needs polling or a subscription on the list query).
• Trace / correlation link — from an expanded decision, jump to sibling calls in the same automation run (needs a correlation query keyed on the run/source ref). Relates to Cross-source linking is broken at 3 layers #562.
• Keyboard navigation — j/k to move between rows, ↵ to expand/collapse, Linear/Superhuman-style.
• Failure-summary filter chip — a toolbar "N failed · 24h" one-tap filter. Note: per-day failure counts already render in the day-group headers (decisions-table-view.tsx); only the clickable toolbar filter is outstanding.

The core audit table (table view, keyset pagination, filters, search, inline expand) is complete; the above were scoped out as enhancements.