Initial commit with dev backbone template

SKILLS/40-testing-quality.md

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+# Testing & Quality
+
+## Strategy
+- If behavior changes: add/update tests.
+- Unit tests for logic; integration tests for boundaries; E2E only where needed.
+
+## Minimum for every PR
+- A test plan in the PR summary (even if “existing tests cover this”).
+- Run DoD.
+
+## Flaky tests
+- Capture repro steps.
+- Quarantine only with justification + follow-up issue.