v5.0.0 — Seed data, E2E tests, SQL Server parity, tutorials

Highlights

• Seed dataset in the repo — 2 matches with pre-computed summaries and embeddings. make seed populates both DBs in <30s, no API key needed.
• 24 E2E tests with Playwright — all 8 pages, both profiles. Auto-generated visual user manual.
• SQL Server parity — seed loading, vector search, full RAG pipeline working on SQL Server 2025.
• 3 tutorials — semantic search, algorithm comparison, embeddings explained.
• Embedding model standardization — only text-embedding-3-small active.
• Contributor governance — CONTRIBUTING.md, issue templates, project labels.

PRs included

#43, #45, #46, #47, #49, #50, #51, #53, #54, #55, #56, #57, #58, #59

Test results

• Backend: 530 passed (80%+ coverage)
• E2E: 24 passed, 1 skipped
• CI: lint + typecheck + tests green

Full changelog: https://github.com/erincon01/RAG-Challenge/blob/main/CHANGELOG.md#500---2026-04-19--seed-data-e2e-tests-sql-server-parity-tutorials