v1.7.0 — Cross-version investigation + dashboard interop

Investigation release. Cross-version regression analysis (v2.1.81/83/90/101), CACHE_FIX_DUMP_TOOLS diagnostic, full anthropic-* header capture, cost-factor metric, sim-cost-reconcile wrapper, and usage-to-dashboard-ndjson translator for @fgrosswig's claude-usage-dashboard interop. Blog: https://veritassuperaitsolutions.com/5-minute-baseline-tools-array/