Add qa-orchestra QA lifecycle agents (functional-reviewer, test-scenario-designer, bug-reporter, automation-writer, orchestrator)

[Anasss]

Summary

Adds 5 QA lifecycle agents from qa-orchestra, a coordinated 10-agent QA toolkit for Claude Code:

• functional-reviewer — Compares code diffs against acceptance criteria to find functional gaps and regression risks
• test-scenario-designer — Generates comprehensive test scenarios (happy path, negative, boundary, edge cases) from acceptance criteria
• bug-reporter — Converts QA findings into structured, developer-ready bug reports with reproducible steps
• automation-writer — Converts test scenarios into executable Playwright/Cypress/Gherkin test code
• qa-orchestrator — Routes QA tickets to the right specialized agents in the right order

These 5 are the most generally useful agents from the full 10-agent toolkit. They work together via output chaining — each agent writes to a shared output directory, and the next agent reads from there. For example: functional-reviewer produces a gap report, bug-reporter reads it and generates individual bug reports.

The remaining 5 agents in the full toolkit (environment-manager, browser-validator, manual-validator, regression-analyzer, release-certifier) are more environment-specific and kept in the main repo.

Format

All files follow the existing frontmatter format in this repo (name, description, tools, model fields).