docs: refresh test-slice mentions to match 4-slice CI reality

[emeraldleaf]

Summary

After #109 wired Payment + Shipping integration tests into CI, two doc sites still claimed only Catalog + Order slices existed. Surfaced by a doc-drift sweep after the /check-rules audit.

Changes

• README.md:19 — List all four slices with their containers (Catalog: Postgres+Redis, Order: SQL Server+stubbed Wolverine, Payment: SQL Server, Shipping: Postgres). Rephrase "134 unit + integration slices" as "100+ unit + integration tests" so the precise number stops drifting every PR.
• docs/architecture.md:546 — Update the slice list to all four; clarify the remaining gap is wire-level cross-service coverage specifically (single-service slices are no longer the gap).

What this is NOT

• No rule changes
• No diagram changes (all 14 SVG/Excalidraw diagrams depict architecture / data flow / cache / outbox / migrations / dev-loop — none depict CI or test slices, so none drifted with ci: wire Payment + Shipping integration tests into CI #109)
• No code changes

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Updated test coverage documentation to reflect current test volume and integration testing strategy.
  • Clarified cross-service integration testing approach, including breakdown of database-touching services and CI execution strategy.

[coderabbitai]

Caution

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between b67ad63 and adc6851.

📒 Files selected for processing (2)

• README.md
• docs/architecture.md

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Walkthrough

This PR updates documentation to reflect the current test infrastructure. README.md clarifies the Testcontainers integration-test volume and enumerates the four service slices (Catalog, Order, Payment, Shipping) with their respective database and transport configurations. docs/architecture.md expands the cross-service integration test coverage description from two services to four DB-touching services, while identifying the remaining gap as an end-to-end event-flow test over Azure Service Bus.

Changes

Test Coverage Documentation

Layer / File(s)

Summary

Test coverage documentation updates README.md, docs/architecture.md

README verification bullet updated to reflect test count and enumerate Testcontainers slices for Catalog (Postgres + Redis), Order (SQL Server + stubbed Wolverine), Payment (SQL Server), and Shipping (Postgres) with separate CI steps. Architecture documentation updated to describe cross-service integration test coverage across four services and clarify the remaining end-to-end event-flow test gap over Azure Service Bus emulator.

🎯 1 (Trivial) | ⏱️ ~2 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/refresh-test-slice-mentions

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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