README: add spend_model/geo/fire_target modules, the recompute-fire-targets
command, and the fire_target table. PLAYBOOK_VIKTOR.md: add a superseded-notice
header — it anchors on Cyprus/£1.5M/£60k, but the base case moved to Bulgaria,
real NW is ~£1.13M, and the simulator now drains tax (so its regime-invariant
claim is false). Point readers to the live FIRE Countdown dashboard.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
