Analyst PRD Wizard + Industry Templates (guided creation, not auto-fill)

[DevVig]

Summary
Add an interactive PRD Wizard that guides users through industry-standard sections with prompts and examples. Provide domain-specific templates (e.g., B2B SaaS, Marketplace, Fintech, Healthcare) and make the wizard the default path for @analyst assess fresh rather than auto-generating a generic PRD.

Why

• Prevents low-quality, generic PRDs; captures goals/aims explicitly
• Aligns A2Dev with best practices across industries

Scope

• New CLI: a2dev prd-wizard and route option from @analyst
• Domain templates under .a2dev/templates/prd/*.md
• Inline guidance and examples in each section, with “what good looks like” checklists

Tasks

• Add wizard command in a2a/cli.py with prompts for: Summary, Goals & Success Metrics (SMART), Users & Personas, Problem Statement, Scope/Out of Scope, Functional Areas/Epics, NFRs (security/privacy/perf/reliability/a11y/observability), Constraints & Assumptions, Dependencies & Risks, Analytics, Rollout Plan, Open Questions
• Store interim answers; allow save/resume
• Add domain templates: prd_saas.md, prd_marketplace.md, prd_fintech.md, prd_healthcare.md
• Update @analyst greeting to offer: (1) Wizard (2) Use Prepared PRD (3) Brownfield assessment
• Write to docs/PRD.md and back up previous version to docs/archive/PRD-<ts>.md
• Unit tests for prompt-to-doc flow; ensure idempotent writes

Acceptance Criteria

• Running @analyst offers Wizard; completing it produces a PRD with all required sections
• Domain choice influences examples and checklists
• Cyon test: wizard captures business goals and aims before stories; avoids placeholder content

References

• Cyon repo docs with goals (e.g., CYON_VALUE_OFFERING_COMPREHENSIVE.md)
• .a2dev/templates/prd.md in A2Dev (baseline)