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Error handling (Prompt 2): - src/services/errors.ts: AppError class, normalizeError(), throwServiceError() helper - 6 services wrapped with try/catch (property, match, need, shortlist, futureSignal, inquiry) - inquiryService aligned from custom ServiceResult<T> to standard ServiceResponse types - Results, MatchCenter, FutureAvailability pages show <ErrorState onRetry> on query failure AI modularisation (Prompt 3): - src/services/aiService.ts reduced from 755 → 19 lines (barrel re-export) - src/services/ai/IAIService.ts: typed interface + all response types - src/services/ai/mock/: needParser, compareBuilder, decisionBrief, listingParser, MockAIService - src/services/ai/openrouter/OpenRouterAIService.ts: model-agnostic skeleton - src/services/ai/prompts/: 4 prompt template files (needParsing, matchExplanation, compareSummary, decisionBrief) - src/services/ai/index.ts: factory selects Mock or OpenRouter via VITE_USE_REAL_AI flag - All existing import paths unchanged — zero call-site modifications Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>