Add source citations to bill timeline events

[ThatXliner]

Summary

• carry official source URLs, locators, and text classification with every newly ingested Congress.gov action
• fetch every action page and persist refreshed action metadata atomically with its date and text
• link recorded votes to their exact House Clerk or Senate record, with the stable Congress.gov all-actions page for actions that have no individual public URL
• show a compact citation on each timeline event, distinguish official, derived, and legacy labels, and explicitly mark events without a source
• deduplicate identical timeline events and improve date/provenance formatting
• retain the full official bill record as the timeline fallback
• provide a read-only-by-default backfill command with an explicit production-write guard

Why

The existing timeline only exposed one generic bill link, so readers could not verify which official record supported an individual event. Legacy records also needed an honest missing-source state rather than an invented citation.

Validation

• pnpm --filter @acme/scraper test
• pnpm --filter @acme/db typecheck
• pnpm --filter @acme/api typecheck
• pnpm --filter @acme/scraper typecheck
• pnpm --filter @acme/expo typecheck
• pnpm --filter @acme/db lint
• pnpm --filter @acme/api lint
• pnpm --filter @acme/expo lint
• production dry run for H.R. 9339: 6 actions, 6 sourced, 0 writes
• verified production writes are rejected without --confirm-production

Closes #147

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Project	Deployment	Actions	Updated (UTC)
billion-nextjs	Ready	Preview, Comment	Jul 14, 2026 3:12am