Includes:
- feat: parse_field15 ICAO route tokenizer + RouteResolver integration
  (qualifier handling, AIRWAY/UNKNOWN demotion, detour-gate filter,
  multi-candidate disambiguation via resolve_point_near)
- fix: AIRAC-aware autorouter cache (prevents stale data across cycles)
- test: end-to-end parse + resolve coverage against real filed routes

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>