feat: Harness Templates — reusable planner→generator→evaluator architectures

[ryaneggz]

Summary

• Adds spec and implementation plan for Harness Templates: pre-built multi-agent architectures (planner → generator → evaluator) that users can select, fork, and customize
• Defines HarnessTemplate entity with four built-in templates (Solo, Reviewed, Full Harness, Frontend Design)
• Plans CRUD API, seeder, assistant integration, and frontend template selector

Closes #911

Implementation Plan

Five phases outlined in .claude/plans/harness-templates.md:

1. Schema & Data Layer — HarnessTemplate entity, migration, repository
2. Seeder & Built-in Templates — Four idempotent built-in templates
3. API Endpoints — CRUD at /api/v0/templates with fork support
4. Assistant Integration — Template selection in creation flow
5. Frontend — TemplateCard grid, preview, fork button

Dependencies

• Evaluator agent spec (evaluator-agent.md)
• Planner agent spec (planner-agent.md)

Test plan

• Unit tests for HarnessTemplate schema validation
• Unit tests for built-in template deletion protection
• Integration tests for CRUD API lifecycle
• Integration tests for seeder idempotency
• Integration tests for assistant creation from template
• Frontend tests for TemplateCard and TemplateSelector components

🤖 Generated with Claude Code

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• Commit unit tests in branch feat/harness-templates

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