Maintenance of the nu-validator coverage benchmark: defend the invariants (nu-only = 0, xref audit green), follow up a nu-validator upstream update (submodule bump / Docker image drift), and regression-check after markuplint rule or spec changes. Use when updating the validator submodule, when a bench refresh surfaces new nu-only entries, when excluded-ids entries go stale, or for the periodic health check. Trigger keywords: bench maintain, bench maintenance, nu update, submodule bump, validator update, bench refresh, nu-only regression, stale excluded-ids, image digest.

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Enable an existing or newly-added markuplint rule on the nu-validator bench by editing tests/external/bench/config.ts. Covers the flat-rule case (rules: { '<name>': true }) and the severity override case (rules: { '<name>': { severity: 'error' } }) that bench-virtual-rule does not. Use when a rule exists in the registry but the relevant nu fixtures stay nu-only because the rule is not enabled in the bench config, or when a rule's default severity is warning but the spec text it mirrors is a MUST / MUST NOT. Trigger keywords: enable bench rule, bench config flat rule, severity override bench, rule not flagging on bench, warning vs error in bench, escalate severity bench, no-contradictory-aria-prop bench, bench coverage missing rule.

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Set up the nu-validator benchmark environment — initialise the validator submodule, ensure Docker is running, populate the gitignored raw snapshots via yarn bench:update. Also covers Docker / nu-runner troubleshooting. Use when bench commands fail with "no snapshots found", "Docker daemon not reachable", port 28888 conflicts, or healthcheck timeouts; or when refreshing the bench after a long break. Trigger keywords: bench setup, bench Docker, validator submodule, no snapshots found, Docker daemon not reachable, healthcheck times out, port 28888, yarn bench:update first time, bench install, fresh clone bench.

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Triage one nu-only fixture from tests/external/snapshots/diff/nu-only.json by reading the spec, then drive its verdict to match-error, match-clean, or nu-over by either fixing markuplint or recording an excluded-ids.json entry. The core per-fixture operation of the nu-validator coverage benchmark. Use when a bench refresh surfaces new nu-only entries, when checking a coverage-claim ("markuplint misses X" / "over-detects Y") against the bench, or when classifying a specific fixture. Trigger keywords: nu-only, ml-only, coverage gap, bench triage, verdict, match-error, match-clean, nu-over, excluded-ids, declare nu over-detection, claim audit, audit fixture, mark-up valid per spec, spec-cited exclusion.

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Mirror a preset virtual rule (selectors under `nodeRules` in preset.html-standard.jsonc and similar) into bench/config.ts so the benchmark exercises it. Use when a new disallowed-element / similar selector lands in a preset and the matching nu fixtures remain stuck at nu-only despite the new rule existing in markuplint. Trigger keywords: virtual rule, nodeRules, disallowed-element, preset html-standard, bench config mirror, rule does not fire on bench, preset rule not exercised.

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Sync benchmark cross-reference blocks onto GitHub Issue bodies via `yarn bench:xref`, manage `tests/external/bench/issue-xref.config.ts` mappings, and run the pre-release checklist. Use when adding / removing / updating a primary or secondary mapping, when an issue closes upstream, when the xref CLI's output disagrees with what's on the issue body, or before cutting a release that touches a rule the benchmark covers. Trigger keywords: bench-xref, issue-xref, xref CLI, GitHub issue body, primary mapping, secondary mapping, umbrella block, pre-release checklist, bench-xref-audit workflow, marker version.

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