feat(directives): add rule-statement header to 41-48 of 66 v1.md files

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2026-07-03 09:45:49 -04:00
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# Tests must not do real I/O against the filesystem or network — isolate under tests/artifacts/
## The 4 test infrastructure principles
1. **No real I/O during tests** — every test gets a sandboxed workspace via the `isolate_workspace` autouse fixture.