feat: ingest sales-outbound-strategist agent

- Source: Agent/agency-agents/sales/sales-outbound-strategist.md
- Add wiki/sources/sales-outbound-strategist.md (source page)
- Add 4 new concept pages: Signal-Based-Selling-Framework,
  ICP-Ideal-Customer-Profile, Multi-Channel-Sequence-Architecture,
  Account-Tiering-Model
- Update overview.md: add Sales Outbound Methodology section
- Update index.md: add source entry + concept entries
- Update existing concepts: Challenger-Sales-Model, Land-and-Expand
- Append log.md entry

wiki/concepts/Multi-Channel-Sequence-Architecture.md

@@ -0,0 +1,88 @@
+---
+title: "Multi-Channel Sequence Architecture"
+type: concept
+tags: [sales, outbound, engagement]
+sources: [sales-outbound-strategist]
+last_updated: 2026-04-25
+---
+
+## Definition
+
+多渠道触达序列架构——在 3-4 周内通过 8-12 次触点跨越多个渠道（Email/LinkedIn/Phone/Video）的出站序列，每次触达必须提供新的价值角度。
+
+> "Each touch must add a new value angle. Repeating the same ask with different words is not a sequence — it is nagging."
+
+## Core Architecture
+
+**结构：8-12 次触点 / 3-4 周 / 多渠道变化**
+
+每次触点必须：
+1. 使用不同渠道
+2. 提供新的信息角度
+3. 包含一个软性 CTA（永远不重复同样诉求）
+
+## Channel Selection by Persona
+
+| Persona | Primary | Secondary | Tertiary |
+|---------|---------|-----------|----------|
+| C-Suite | LinkedIn InMail | Warm intro/referral | Short direct email |
+| VP-level | Email | LinkedIn | Phone |
+| Director | Email | Phone | LinkedIn |
+| Manager/IC | Email | LinkedIn | Video (Loom) |
+| Technical buyers | Email (technical content) | Community/Slack | LinkedIn |
+
+## Reference Sequence Template (10 Touches)
+
+```
+Touch 1 (Day 1, Email):   Signal-based opening + specific value prop + soft CTA
+Touch 2 (Day 3, LinkedIn): Connection request with personalized note (no pitch)
+Touch 3 (Day 5, Email):   Share relevant insight/data point tied to their situation
+Touch 4 (Day 8, Phone):   Call with voicemail drop referencing email thread
+Touch 5 (Day 10, LinkedIn): Engage with their content or share relevant content
+Touch 6 (Day 14, Email):   Case study from similar company/situation + clear CTA
+Touch 7 (Day 17, Video):  60-second personalized Loom showing something specific to them
+Touch 8 (Day 21, Email):  New angle — different pain point or stakeholder perspective
+Touch 9 (Day 24, Phone):  Final call attempt
+Touch 10 (Day 28, Email): Breakup email — honest, brief, leave the door open
+```
+
+## Cold Email Anatomy
+
+### Subject Line
+- 3-5 words, lowercase, looks like internal email
+- Reference signal or specificity: "re: the new data team"
+- Never clickbait, never ALL CAPS, never emoji
+
+### Opening Line (Signal-Based)
+```
+Bad:  "I hope this email finds you well."
+Bad:  "I'm reaching out because [company] helps companies like yours..."
+Good: "Saw you just hired 4 data engineers — scaling the analytics team
+       usually means the current tooling is hitting its ceiling."
+```
+
+### Value Proposition
+- One sentence connecting their situation to an outcome they care about
+- Use their vocabulary, not your marketing copy
+- Specificity beats cleverness: numbers, timeframes, concrete outcomes
+
+### CTA (Single, Clear, Low Friction)
+```
+Bad:  "Would love to set up a 30-minute call to walk you through a demo"
+Good: "Worth a 15-minute conversation to see if this applies to your team?"
+Good: "Open to hearing how [similar company] handled this?"
+```
+
+## Rules of Sequence Design
+
+1. **Never send without a reason the buyer should care right now**
+2. **If you cannot articulate why you are contacting this specific person at this specific company at this specific moment, you are not ready to send**
+3. **Do not automate what should be personal, and do not personalize what should be automated**
+4. **Test one variable at a time** — changing subject + opening + CTA simultaneously learns nothing
+5. **Document what works** — a playbook that lives in one rep's head is not a playbook
+
+## Connections
+
+- [[sales-outbound-strategist]] — 序列架构来源
+- [[Signal-Based Selling Framework]] — 序列触发信号来源
+- [[Account Tiering Model]] — 不同层级账户的序列定制程度不同