cost-projection

Forward-looking cost projection that pairs with cost-budget-check:

• cost-budget-check answers "have we crossed the line?" — reactive
• cost-projection answers "when will we cross the line?" — predictive

Algorithm

1. Read all session-* records from the cost-tracking namespace (same source cost-budget-check uses).
2. Filter to a measurement window (default last 7 days on capturedAt/startedAt).
3. Compute the per-day burn rate: windowSpend / windowDays.
4. Linear-extrapolate to each requested horizon (default 7d/30d/90d/365d).
5. If a budget is configured (budget-config key set by cost-budget set):
   • Compute "days until 75% / 90% / 100% consumed" at the current rate.
   • Surface as a separate table block with ALREADY REACHED markers for thresholds already exceeded.

Flags