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2833906c68
Extract duplicated retry logic from OverpassService and RoutingService into a shared resilience framework in service_policy.dart: - ResiliencePolicy: configurable retries, backoff, and HTTP timeout - executeWithFallback: retry loop with primary→fallback endpoint chain - ErrorDisposition enum: abort / fallback / retry classification - ServicePolicy + ServicePolicyResolver: per-service compliance rules (rate limits, caching, concurrency) for OSMF and third-party services - ServiceRateLimiter: async semaphore-based concurrency and rate control OverpassService now hits overpass.deflock.org first, falls back to overpass-api.de. RoutingService hits api.dontgetflocked.com first, falls back to alprwatch.org. Both use per-service error classifiers to determine retry vs fallback vs abort behavior. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>