Adds four behavioural blocks for testing paradigms beyond unit tests
(test-gen already covers unit-test generation):
- test-fuzz.md — cargo-fuzz/hypothesis/fast-check corpus + triage + CI
- test-property.md — proptest/hypothesis/fast-check invariants + shrinking
- test-load.md — k6/vegeta/oha/hyperfine baseline→profile→fix loop + SLO
- test-e2e.md — Playwright page-objects + trace viewer + flake policy
Each block 32-53 LOC (within 60-LOC block cap). Single-concern,
composable via _manifests/*.toml like any other _blocks/*.md.
Tooling cited at [E4] based on official docs; version pinning deferred
to consumers.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
