Add Tech Stack Documentation System

[codegen-sh]

This PR implements a comprehensive tech stack documentation system for devagent, replicating the successful pattern from the reportory repository.

📋 What's New

1. Tech Stack Template (.devagent/memory/tech-stack-template.md)

A reusable template for documenting technology stacks across any project. Includes comprehensive sections for:

• Core stack (framework, runtime, build tools)
• Frontend & backend technologies
• Data & state management
• Testing & quality tools
• Hosting & infrastructure
• CI/CD setup
• AI & external services
• Product capabilities and constraints

2. DevAgent Tech Stack (.devagent/memory/tech-stack.md)

Complete documentation of devagent's own technology stack, highlighting:

• Markdown-based agent workflow system
• Tool-agnostic design principles
• Git-based state management
• Date-prefixed organizational structure
• Background execution via Codegen API

3. TechStackAgent (.devagent/agents/TechStackAgent.md)

A new specialized agent that:

• Analyzes codebases to detect technologies (package manifests, configs, CI/CD)
• Gathers missing context through structured developer questions
• Creates or updates tech stack documentation following the template
• Integrates with other agents (#ResearchAgent, #ProductMissionPartner, etc.)
• Provides validation and gap identification

4. Agent Roster Updates (AGENTS.md)

• Registered #TechStackAgent in the main roster
• Added #AgentBuilder to the roster (was missing)
• Both agents now discoverable via hash triggers

🎯 Usage

Invoke the agent to document any project:

#TechStackAgent please document the tech stack for [project-name]

The agent will:

1. Scan for package manifests and config files
2. Detect technologies and versions
3. Ask clarifying questions for gaps
4. Generate comprehensive tech-stack.md documentation

🔄 Integration

This system integrates with:

• #ProductMissionPartner - Tech stack informs mission alignment
• #SpecArchitect - References stack for feasibility checks
• #TaskPlanner - Uses stack to identify testing/build requirements
• #ResearchAgent - Validates technology choices

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Requested by: Jake Ruesink

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codegen-bot/tech-stack-setup-1759338694

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