v1.0.0 - Token Economy

Initial public release of the Token Economy Spec Kit extension.\n\nIncludes three commands:\n- speckit.token-economy.route-evidence\n- speckit.token-economy.report-savings\n- speckit.token-economy.audit-context\n\nThis release adapts token-router's raw evidence routing pattern and token-saver's measured-only RTK/Headroom reporting policy for Spec Kit extensions.