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IAIService: + generateMatchExplanation, summarizeTradeOffs, generateDataQualitySummary, classifyMarketSignal (4 new methods covering all documented AI output types) OpenRouterAIService: - All 11 methods now make real API calls via withFallback() pattern - Every fallback is explicit (console.warn/error) — no silent mock bleed-through - Proper JSON extraction with type-safe parsers, no any casts - parseNeed: AI JSON → ParseNeedResult mapping (no TODO stubs) - generateFollowUpQuestions, generateMatchExplanation, summarizeTradeOffs, generateDataQualitySummary, classifyMarketSignal, generateOfferEmail, extractCriteria, generateFollowUp: fully implemented Prompts: +followUpQuestionsPrompt, +tradeOffPrompt, +dataQualityPrompt, +marketSignalPrompt Factory (index.ts): - VITE_AI_PROVIDER=mock|openrouter (new, takes priority) - VITE_USE_REAL_AI=true still supported (legacy compat) - Missing API key → explicit console.warn + MockAIService fallback Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>