Add qualifier agent with prequalification workflow

[biliboss]

Summary

• add qualifier agent focused on pre-sales lead assessment
• create prequalify task and qualification-email-tmpl template
• document Big Picture EventStorming for the subscription service
• bundle the new agent to dist/agents

Testing

• npm run validate
• npm run build:agents

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https://chatgpt.com/codex/tasks/task_e_6856aa3c4e70832a83622a70729c4f1f

[hyperlint-ai-deprecated]

PR Change Summary

Introduced a new qualifier agent and a service designer agent, along with associated tasks and templates for prequalification and EventStorming workflows.

• Added a new qualifier agent for pre-sales lead assessment.
• Created prequalify task and qualification-email-tmpl template.
• Introduced a service-designer agent for EventStorming sessions.
• Documented the Big Picture EventStorming process for the subscription service.

Added Files

• bmad-core/agents/qualifier.md
• bmad-core/agents/service-designer.md
• bmad-core/tasks/create-big-picture.md
• bmad-core/tasks/prequalify.md
• bmad-core/templates/big-picture-eventstorming-tmpl.md
• bmad-core/templates/qualification-email-tmpl.md
• docs/big-picture-eventstorming.md

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