[Epic] Open-source readiness

[nora-weisser]

Open-source readiness

Umbrella issue tracking the work to make wcc-qa welcoming to external contributors. The codebase already has a strong technical foundation (README, Apache 2.0 license, ESLint/Prettier/Husky, type-safe Faker+Zod API layer). The gaps are governance and automation, not code quality — no .github/, no CI, no contributor guides.

Outcome: a newcomer can, in minutes, understand the project, find a good-first-issue, know how to open a PR, and get automated fast feedback (lint/typecheck) — with clear community standards and maintainer ownership.

P0 — Contributor entry points

• Add CONTRIBUTING.md #22 — Add CONTRIBUTING.md
• Add CODE_OF_CONDUCT.md  #23 — Add CODE_OF_CONDUCT.md (Contributor Covenant v2.1)
• Add Contributing + Community sections to README.md #24 — Add Contributing + Community sections to README.md

P1 — Automation & governance

• Add CI workflow: lint + format + typecheck #25 — Add CI workflow: lint + format + typecheck
• Add GitHub issue templates #26 — Add GitHub issue templates
• Add PR template #27 — Add PR template
• Add CODEOWNERS #28 — Add CODEOWNERS

P2 — Polish & consistency

• Add .editorconfig #29 — Add .editorconfig
• Add SECURITY.md #30 — Add SECURITY.md
• Decide & document the .claude/ folder #31 — Decide & document the .claude/ folder

Deferred

• Full E2E in CI against a dockerized backend (deferred) #32 — Full E2E in CI against a dockerized backend