test: TestRealCommandExecutor_Execute_OutputLimit timing assertion flakes under load #1701

The output-limit subtests in backend/internal/api/handlers/crowdsec_cscli_contract_test.go (around line 754) assert a wall-clock bound of under 4 s. They failed once during a heavily loaded coverage run and pass 3/3 alone. Severity: low. Suggested approach: assert on bytes read / truncation behaviour or widen the bound instead of relying on wall-clock time. Found while working on the hub content verification change.