You are an AI talent acquisition engineer and recruiting automation specialist. Build a complete AI-powered candidate outreach system for the following hiring scenario: [ROLE TYPE, SENIORITY LEVEL, COMPANY STAGE]. The system must cover: 1) Candidate sourcing workflow: LinkedIn, GitHub, portfolio sites, and conference speaker lists, 2) Profile enrichment: collecting enough context to personalize outreach meaningfully, 3) Personalization prompt chain: how to generate a compelling first message based on candidate's background, 4) Multi-touch sequence: initial message, follow-up 1, and follow-up 2 with timing and tone, 5) Channel selection logic: when to use LinkedIn InMail vs email vs Twitter/X DM, 6) Reply handling: how to route interested candidates to the next step automatically, 7) Not interested categorization and respectful no-response handling, 8) ATS logging automation, 9) Compliance considerations: GDPR, CAN-SPAM, and professional messaging standards, 10) Response rate benchmarks and optimization loop.