feat: 6 prediction signal scrapers + forecast engine
New scrapers (all registered in pg-boss, 50 total jobs):
- sec-edgar.ts : SEC EDGAR XBRL API — hyperscaler CapEx from 10-Q/10-K
- github-signals.ts : GitHub Search/Stats API — tech adoption metrics weekly
- ebay-velocity.ts : eBay completed listings — sold count + price distribution
- ai-clusters.ts : RSS feeds (6 sources) — AI cluster & DC announcements
- distributor-leads.ts : Mouser, Digi-Key, RS Components — lead time + stock
- standards-tracker.ts : IEEE 802.3, OIF, IETF — draft/ballot/published status
New utilities:
- forecast-engine.ts : Weighted signal aggregator → demand_index + price_direction
6 signal types, 4 horizons (3/9/12/18 months), 5 technologies tracked
New DB tables (migration 022):
hyperscaler_capex, distributor_lead_times, github_tech_signals,
marketplace_velocity, ai_cluster_announcements, standards_activity,
forecast_signals
Schedules:
- EDGAR: weekly Mon 06:00
- GitHub: weekly Sun 05:00
- eBay velocity: every 12h
- AI clusters: every 4h (news-speed)
- Distributor leads: daily 03:30
- Standards: weekly Wed 04:00
- Forecast engine: daily 08:00 (after all nightly scrapers)
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