fix(create-expert): sync AGENTS.md template with actual architecture

[FL4TLiN3]

Summary

Update the PBT framework architecture diagram in AGENTS.md template to match the actual implementation.

Changes

Architecture Diagram

Before (incorrect):

create-expert (Coordinator)
├── property-extractor
├── happy-path-manager      ← doesn't exist
│   ├── expert-designer     ← doesn't exist
│   └── expert-tester
├── unhappy-path-manager    ← doesn't exist
├── adversarial-manager     ← doesn't exist
└── report-generator

After (correct):

create-expert (Coordinator)
├── property-extractor
├── ecosystem-builder
├── integration-manager
│   ├── functional-manager
│   │   └── expert-tester
│   └── usability-manager
│       └── expert-tester
└── report-generator

Also Fixed

• Removed references to non-existent think tool from examples

Test plan

• CI passes
• Generated AGENTS.md has correct architecture diagram

Closes #351

🤖 Generated with Claude Code

---

Note

Aligns the AGENTS.md template with the implemented PBT framework and cleans up invalid tool references.

• Updates architecture in apps/create-expert/src/lib/agents-md-template.ts: replaces non-existent managers (happy-path/unhappy-path/adversarial-manager, expert-designer) with ecosystem-builder, integration-manager (with functional-manager and usability-manager, each using expert-tester); refines property-extractor description
• Removes think from example pick lists and base skill docs; control-flow tools now attemptCompletion, todo
• Adds changeset: .changeset/sync-agents-md-architecture.md

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✅ All modified and coverable lines are covered by tests.

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