[Feature Request] Enhance Brownfield Bootstrap - Constitution & Template Generation

[kanfil]

Summary

Extend brownfield support beyond architecture reverse-engineering to include constitution and template generation from existing code.

Problem

• Community extension ([Extension Proposal] Brownfield Bootstrap: SDD Workflow for Existing (Brownfield) Projects github/spec-kit#1436 in upstream) provides this functionality
• Current /architect.init only covers architecture, not coding conventions
• Brownfield projects need customized templates reflecting existing patterns

Current State

✅ Already Implemented:

• /architect.init - Reverse-engineer architecture from existing codebase (brownfield)
• Templates: templates/commands/architect.init.md
• Scripts: scripts/bash/setup-architecture.sh, scripts/powershell/setup-architecture.ps1
• Detects tech stack, frameworks, patterns from code
• Generates ADRs from discovered decisions

❌ Still Needed:

• Constitution from code patterns (extract coding conventions)
• Customized templates from existing code style
• Multi-module mapping (Maven, Gradle, monorepos)

Proposal

1. Constitution from Code Patterns

• Extract coding conventions from existing code
• Generate constitution.md with project-specific principles
• Detect patterns: naming conventions, error handling, testing approach

2. Customized Templates

• Adapt spec/plan templates to project conventions
• Code placement decision trees for each module

3. Integrate Community Extension

• Consider adopting [Extension Proposal] Brownfield Bootstrap: SDD Workflow for Existing (Brownfield) Projects github/spec-kit#1436 extension into core

Priority

Medium - Community demand proven

References

• Current brownfield: /architect.init
• Community extension: https://github.com/wcpaxx/spec-kit-brownfield-extensions