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The SSR mapping was missing publishedDate so cards never got it.

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Co-Authored-By: Letta Code <noreply@letta.com>

- Enrichment prompt now asks for publishedDate in YYYY-MM-DD format
- Cards show date (month+day when available, year otherwise)
- publishedDate derived from URL patterns and LLM inference
- All 26 records now have publishedDate

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Co-Authored-By: Letta Code <noreply@letta.com>

Was sequential (26 records × 30s = 14min). Now batches of 5
concurrent calls — should be ~3min for 26 records.

Applies to poll endpoint, cron handler, and /api/enrich.

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Co-Authored-By: Letta Code <noreply@letta.com>