Promote fast artifact provenance loading

[bashybaranaba]

Staging verification

• staging API deployment completed successfully with migration 031 applied
• staging web deployment is ready on the staging Vercel alias
• live XLSX, DOCX, PPTX, PDF, and interactive HTML creation/preview/download passed
• every artifact resolved exact-trace provenance
• provenance retrieval measured 425–556 ms (556 ms maximum)
• selective provenance-only sharing passed
• agent Library recent/type discovery passed
• smoke artifacts and fixture agent were cleaned up

Change

• fixes the UI cancellation race that caused indefinite “Loading provenance…”
• warms and deduplicates provenance requests with timeout/retry behavior
• bounds UI event retrieval to the newest 40 events and parallelizes independent queries
• adds indexed revision-lineage lookup and clear truncation disclosure

[vercel]

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Project	Deployment	Actions	Updated (UTC)
agent-commons (staging)	Ready	Preview	Aug 31, 2026 4:09pm
agent-commons-commons-docs	Ready	Preview	Aug 31, 2026 4:09pm
commons-courses	Ready	Preview	Aug 31, 2026 4:09pm